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篇一:[语法英语]高考英语语法词语要点
英语写作词语选择的要点
1．词语选择的重要性
在The Right Word at the Right Time的“序言”中，编者对词语选用的重要性作了一个很好的比喻：“Using the right word at the right time is rather like wearing appropriate clothing for the occasion：it is a courtesy to others，and a favor to yourself-a matter of presenting yourself well in the eyes of the world.”
显然，说话或写文章时用词适当比穿着适当难度大得多，因而也具有更大的重要性。
在我国，古人写文章时常为一个词语的选用具思苦想，因而有“语不惊人死不休”的说法。
成语“一字值千金”也说明了选择词语的极端重要性。有时“一字之差”造成令人遗憾的败笔，或招致成千上万的经济损失。这些反面的教训也告诉我们必须重视词语选用的问题。
2．词语选择的可能性
实际上，我们每个人的脑子里都有了一个或大或小的词库，只要我们肯去发掘，往往可以得到更好的表达方式。这是我们做好词语选用的主观条件。
我们猜您可能喜欢以下文章： 高考英语语法:高中英语语法-英语中一词多义的理解高考英语语法:高中英语语法-英语写作词语选择的要高考英语语法:高中英语语法-英文写作中词语的选择 高考英语语法:高中英语语法-英语写作词语选择的要点
从客观条件广看，我们有各种类型的词典和参考书，只要我们平时多翻译、多阅读，写作时勤查考，就会在词语选用上不断进步。当然，一部好词典也不会毫无缺点，更难以面面俱到，因此在这里我们应牢牢记住著名英国作家、评论家和辞书编纂家Johson的话：
Dictionaries are like watches：the worst is better than none，and the best cannot be expected to go quite true.
3．词语选择的三项标准
关于择语标准，人们说法不一，但准确、鲜明、生动三项原则是公认的。当然，某词语用得是否符合要求，不可孤立地从词语本身的含义上着眼，还要看其具体使用场合，包括同其他词语搭配等。
1）择语的准确性
准确性，就是要根据使用场合选用确切的语言形式，正如有句英语俗语所言：
Do not write so that your words may be undetstood，but write so that your words must be understood.
著名美国作家马克·吐温说：“用词准确与用词几乎准确，这两者之间的差异就如闪电与萤火虫之间的差异。”（The difference between the right word and the almost-right word is as great as that between lighting and the lighting bug．）
我们猜您可能喜欢以下文章： 高考英语语法:高中英语语法-英语中一词多义的理解高考英语语法:高中英语语法-英语写作词语选择的要高考英语语法:高中英语语法-英文写作中词语的选择 高考英语语法:高中英语语法-英语写作词语选择的要点
为了择语准确，必须熟悉词语的多义性。例如depression对心理学家、经济学家或地质学家来说，含义各不相同：
He is in a state of deep depression as a result of his setback latest experiment.
The depression first hit almost all the small and medium-sized enterprises.
Transportation was at a standstill caused by the depressions in the highways after the earthquake in that area.
反之，也常常有几个词语可以表示类似的含义，如心理学上的“depression”也能用melancholia，the blues，the dismal in the dumps，low等词语表示。
要做到准确选择，有必要注意词语的两种意义：“基本意义”（denotation）和“引申意义”（connotation）。前者指该词语的本身，或客观的固有含义，后者指该词语在一定搭配或上下句中出现的其他意义，往往比较含蓄，带有词语使用者的主观态度或感情色彩。如inexpensive和cheap都表示便宜的基本意思，如顾客问营业员：“May I have some thing cheaper？”意思是希望要价钱便宜一点的，当然并不是说质量可以不好，但cheap在其他句式或使用场合可引出“低劣”、“平庸”、“吝啬”、“卑鄙”等多种意思，这类意思正是修辞上的“敏感地带”。
我们猜您可能喜欢以下文章： 高考英语语法:高中英语语法-英语中一词多义的理解高考英语语法:高中英语语法-英语写作词语选择的要高考英语语法:高中英语语法-英文写作中词语的选择 高考英语语法:高中英语语法-英语写作词语选择的要点
选用词语的准确性还表现在区分表示大体/抽象含义的词语和表示具体/特定含义的词语上，需要根据不同的使用场合做出正确的选择。抽象含义词语和具体含义词语不是两个对立的家族，在一定的条件下可以转化，如
labor一词通常带抽象含义，但并非一成不变。试比较：
A）Honest labor creates wealth for the society.
B）In the GM contract dispute，labor seeks a five-cent per hour wage increase.
上述A句中labor一词为抽象含义，泛指各种社会劳动，B句中labor为具体含义，特指WAW，即美国汽车、飞机、农业机械工人联合会。
2）择语的鲜明度
准确性是鲜明度的前提，也是提高鲜明度的基础。然而，鲜明与简练相关。英国文豪莎士比亚的名言“Brevity is the soul of wit”相当于汉语的“言贵简洁”。我们说话、写文章都要以“言简意赅”四字为目标，为此，应从两个方面加以注意：
A．在可以运用较简短的常见词语表达意思时不要用复杂而少的词语，如：do something for（不用perform，accomplish），用end／finish a letter （不用terminate，conclude）。
我们猜您可能喜欢以下文章： 高考英语语法:高中英语语法-英语中一词多义的理解高考英语语法:高中英语语法-英语写作词语选择的要高考英语语法:高中英语语法-英文写作中词语的选择 高考英语语法:高中英语语法-英语写作词语选择的要点
B．多余的或转弯抹角的词语都不利于明白地表达思想，因而下列短语中加括号的部分都应省去：
mutual aid（to each other）（mutual）aid to each other，（an entirely）complete confidence，repeat the question（again），return（back） from abroad，etc．
3）择语的生动感
生动感也可以叫做优美感（gracefulness），它是建筑在准确性和鲜明度的基础上的，否则，单纯追求生动或优雅，就会出现辞藻华丽（flowery）而内容空洞的文风，这是应当避免的。
篇二:[语法英语]高中英语语法课件
导语：下面是小编为你分享的高中英语语法课件，希望能够为大家带来帮助，希望大家会喜欢。同时也希望给你们带来一些参考的作用，如果喜欢就请继续关注我们的后续更新吧！
（1）表语从句
1． 定义：用作表语的从句叫做表语从句。
2． 构成：关联词+简单句
3． 引导表语从句的关联词的种类：
(1) 从属连词that。如：
The trouble is that I have lost his address. 麻烦是我把他的地址丢了。
(2) 从属连词whether, as, as if。如：
He looked just as he had looked ten years before. 他看起来还与十年前一样。
The question is whether they will be able to help us. 问题是他们是否能帮我们。
注：从属连词if一般不用来引导表语从句，但as if却可引导表语从句，如： All this was over twenty years ago, but it"s as if it was only yesterday.
这都是20多年前的事了，但宛如昨天一样。
能跟表语从句的谓语动词一般为系动词be, seem, look等。如：
It looked as if it was going to rain. 看起来天要下雨了。
(3)连接代词who, whom, whose, what, which, whoever, whatever, whichever
连接副词 where, when, how, why。
如：The problem is who we can get to replace her. 问题是我们能找到谁去替换她呢。
The question is how he did it. 问题是他是如何做此事的。
That was what she did this morning on reaching the attic. 那就是她今晨上了阁楼干的。
解释：
1． 连词because可引导表语从句。如：
I think it is because you are doing too much. 我想这是因为你做得太多。
2． 在一些表示“建议、劝说、命令”的名词后面的表语从句中，谓语动词用虚拟语气。should+动词原形表示，should可省略。如：
My suggestion is that we (should) start early tomorrow. 我的建议是我们明天一早就出发。
（2）主语从句
1． 定义：用作主语的从句叫做主语从句。
2． 构成：关联词+简单句
3． 引导主语从句的关联词有三类：
(1) 从属连词that。 如：That they were in truth sisters was clear from the facial resemblance between them.
很明显，她们确是亲姐妹，她们的脸型很相似。
(2) 从属连词whether。如：
Whether he’ll come here isn’t clear. 他是否会来这里还不清楚。
(3) 连接代词who, whom, whose, what, which, whoever, whatever, whichever 连接副词 where, when, how, why。如：
What she did is not yet known. 她干了什么尚不清楚。
How this happened is not clear to anyone. 这事怎样发生的，谁也不清楚。 Whoever comes is welcome. 不论谁来都欢迎。
Wherever you are is my home ---- my only home. 你所在的任何地方就是我的家----我唯一的家。
解释：
1． 主语从句能用it作形式上的主语。常以it作形式主语的句型有：
A. It+be+形容词(obvious, true, natural, surprising, good, wonderful, funny, possible, likely, certain, probable, etc.)+that从句。如： It is certain that she will do well in her exam. 毫无疑问她考试成绩会很好。
It is probable that he told her everything. 很可能他把一切都告诉她了。
B. It+be+名词词组(no wonder, an honour, a good thing, a pity, no surprise, etc.)+that从句。如：
It’s a pity that we can’t go. 很遗憾我们不能去。
It’s no surprise that our team should have won the game. 我们没赢这场比赛真意外。
C. It+be+过去分词(said, reported, thought, expected, decided, announced, arranged, etc.)+that从句。如：
It is said that Mr. Green has arrived in Beijing. 据说格林先生已经到了北京。
It is reported that China has sent another man-made earth satellite into orbit.
据报道中国又成功地发射了一颗人造地球卫星。
D. It+seem, happen等不及物动词及短语+that从句。如：
It seems that Alice is not coming to the party at all. Alice似乎不来参加晚会。
It happened that I was out that day. 碰巧我那天外出了。
E. It+doesn’t matter (makes no difference, etc.)+连接代词或连接副词引起的主语从句。如：
It doesn’t matter whether she will come or not. 她是否来这无关紧要。 It makes no difference where we shall have the meeting. 我们在哪里开会毫无区别。
F. 当that引导的主语从句出现在疑问句中时，要以it作形式主语，而把主语从句后置。如：
Is it true that the scientist will give us a lecture next week? 下周那位科学家将给我们作报告是真的吗？
Does it matter much that they will not come tomorrow? 他们明天不来很要紧吗？
G. 当主语从句出现在感叹句中时，要以it作形式主语，而把主语从句后置。如： How strange it is that the children are so quiet! 孩子们这么安静真奇怪！
2．注意连接代词whoever, whatever, whichever等引导主语从句的含义
Whoever comes will be welcome. (whoever=the person who) 来的人将受到欢迎。
Whatever he did was right. (whatever=the thing that) 他所做的事情是正确的。
Whichever of you comes in will receive a prize. (whichever=anyone of you who) 你们当中不论哪个进来将会得到奖
（3）宾语从句
1． 定义：用作宾语的从句叫宾语从句。
2． 构成：关联词+简单句
3． 引导宾语从句的关联词有三类：
(1) 从属连词that。如：
He told us that he felt ill. 他对我们说他感到不舒服。
I know he has returned. 我知道他已经回来了。
注： that在引导宾语从句时也并不是任何情况下都可以省略。在以下情况下，that不能省略。
1． Everybody could see what happened and that Tom was frightened.(and连接两个宾语从句，that宾语从句放在and的后面时，that不能省略。) 大家都会看出所发生的事情并知道Tom非常害怕。
2．I know nothing about him except that he is from the south.(that引导的宾语从句作介词宾语时，that不能省略。)
对他我一无所知，只知道他是南方人。
3．That he ever said such a thing I simply don’t believe. (that从句位于句首时，that不可省略。)
我简直不相信他曾说过这样的话。
4． We decided, in view of his special circumstances, that we would admit him for a probationary period. (主句谓语动词与that从句之间有插入语，that不可省略。)
鉴于他的特殊情况，我们决定应允他一段试用期。
(2)从属连词if/whether。如：
I doubt whether he will succeed. 我怀疑他是否会成功。
I don’t know if you can help me. 我不知道你能否帮助我。
(3)连接代词who, whom, whose, what, which, whoever, whatever, whichever 连接副词 where, when, how, why。
如：
Who or what he was, Martin never learned.
他是什么人？他是干什么的？马丁根本不知道。
I wonder what he’s writing to me about. 我不知道他要给我写信说什么事。 I’ll tell you why I asked you to come. 我会告诉你我为什么要你来。 You may do what you will. 你可做任何你想做的事。
(1) 介词宾语从句
宾语从句也可用作介词的宾语。如：
He was deeply displeased by what had occurred that day.
他对那天发生的事感到很不快。
I walked over to where she sat. 我走向她坐的地方。
I am curious as to what he will say. 我很想知道他要说什么。
Your success will largely depend upon what you do and how you do it. 你是否成功将主要取决于你做什么和怎样做。
有时介词可以省略。如：
I don’t care (for) who marries him. 我不管谁跟他结婚。
Be careful (as to) how you do that. 你要注意做这件事的方式。
解释：
1．如果宾语从句后还有宾语补足语，则用it作形式宾语，而将宾语从句后置。如：
We thought it strange that Xiao Wang did not come yesterday.
我们认为小王昨天没来是奇怪的。
He has made it clear that he will not give in.
他已表明他不会屈服。
2．作介词的宾语：连词that引导的名词性从句很少作介词的宾语，只用在except, but, in后。其他一些介词的宾语从句如果由连词that引导，则需用it先行一步，作形式宾语。如：
He is a good student except that he is careless.
他是一个好学生，只是有点粗心。
You may rely on it that I shall help you. 你可以指望我会帮助你的。 介词宾语不可以用which来引导，而要用what来引导。如：
Are you sorry for what you"ve done?
你为你所做的一切感到内疚吗？
3．某些形容词或过去分词后常接宾语从句，这类形容词或过去分词有sure, glad, certain, pleased, happy, afraid, surprised, satisfied等，连词that可省略。如：
I am not sure what I ought to do.
我不能确定我该做什么。
I"m afraid you don"t understand what I said.
恐怕你没领会我说的意思。
I"m surprised that I didn"t see all that before.
我好奇怪，我以前没看到过。
Mother was very pleased her daughter had passed the exams.
妈妈为她的女儿通过了考试而感到高兴。
4．连词whether (or not)或if引导的宾语从句
if和whether引导的宾语从句可以互换使用，但whether常和or not连用，if一般不与or not连用。如：
I wonder whether it is true or not. 我不知它是真是假。
用if引导宾语从句如果会引起歧义，应避免使用if而用wheter。试比较： Please let me know if you want to go.
Please let me know whether you want to go.
if从句可理解为宾语从句，意为“请告诉我你是否想去”；此句又可理解为条件状语从句意为“如果你想去的话，请告诉我一声”。
5．宾语从句的否定转移。在think, believe, suppose, expect等动词后的宾语从句，有时谓语尽管是否定意思，却不用否定形式，而将think等动词变为否定形式。如：
I don’t think you are right. 我认为你错了。
I don’t believe they have finished their work yet. 我相信他们还未完成他们的工作。
I don’t suppose he cares, does he? 我想他不在意，是吗？
6． 宾语从句的时态变化规律：
(1) 当主句是一般现在时态时，从句可根据需要用任何时态。
(2) 当主句是一般过去时态时，从句只能使用过去范围内的任何时态。但客观真理除外。如：
The teacher said that the earth goes round the sun.
老师说地球绕着太阳运行。
（4）同位语从句
1． 定义：用作同位语的从句叫做同位语从句。
2． 用法：同位语从句的先行词多为fact, news, idea, thought, question, reply, report, remark等，关联词多用从属连词that。如：
They were all very much worried over the fact that you were sick. 对你生病这件事，他们都很焦虑。
Where did you get the idea that I could not come?
你在哪儿听说我不能来？
Early in the day came the news that Germany had declared war on Russia. 德国已对俄国宣战的消息一大早就传来了。
注：同位语从句偶尔由从属连词whether引导。如：
I have no idea whether he’ll come or not. 我不知道他是否来。
连接代词who, which, what和连接副词where, when, why, how亦可引导同位语从句。
The question who should do the work requires consideration.
谁该干这项工作，这个问题需要考虑。
We haven"t yet settled the question where we are going to spend our summer vacation.
到哪儿去度暑假，这个问题我们还没有决定。
It is a question how he did it.
那是一个他如何做了此事的问题。
解释：
1．that引导的同位语从句与定语从句之区别
that引导的同位语从句
that引导的定语从句
that只起连接从句的作用，无意义。在从句中不充当句子成分。不可省。 that替代先行词在从句中不仅起连接作用，还充当一个句子成分。如在从句中作动词的宾语时可省略。
意义上
从句是被修饰名词的内容。
从句起限定作用，是定语
如：The news that Mr. Li will be our new English teacher is true. (同位语从句，that不可省。)
李先生将是我们的新英语老师这个消息是真的。
The news (that) he told me yesterday is true. (定语从句，that在从句中作told的宾语，可省。)
他昨天告诉我的消息是真的。
2．一些表示“建议、命令、要求”的名词后所跟的同位语从句中，谓语动词用虚拟语气should+动词原形表示。should可省。如：
This is our only request that this (should) be settled as soon as possible. 这就是我们唯一的请求：尽快解决这个问题。
测试：
A. 用适当的连接词填空：
1． It worried her a bit her hair was turning gray.
2. I have no idea we can do with these waste materials.
3. the doctor really doubts is my mother will recover from the serious disease soon.
4. It is hoped nature will never be destroyed.
5. do you guess will give a talk on English tomorrow?
6. ---- I drove to Zhuhai for the air show last week.
---- Is that you had a few days off?
7. Word came I was wanted at the office.
8. Do you know of them will be our new headmaster?
9. The teacher didn"t tell me we were wrong.
10. It"s generally considered unwise to give a child he or she wants.
B. 单项选择：
1． It was true Alice did surprised her mother.
A. that B. what C. that, what D. what, that
2. Does matter much he can"t come to the meeting.
A. it, if B. that, if C. it, whether D. this, whether
3. ----What are you anxious about? ---- .
A. How can we succeed B. Whether we can succeed
C. When can we succeed D. That we can succeed
4. The reason the little actress has been such a success is she is both clever and hard-working.
A. why, why B. why, that C. that, because D. for, because
5. leaves the room last ought to turn off the lights.
A. Who B. Whoever C. Anyone D. The person
6. I really don"t know ____________ I had this photo taken.
A. where it was that B. it was that C. where it was D. it was why
7. Dr. Black comes from either Oxford or Cambridge. I can"t remember .
A. where B. there C. which D. that
8. ----What do you think of China? --- different life is today from it used to be.
A. How, what B. What, what C. How, that D. What, that
9. Give this to you think can do the work well.
A. who B. whom C. whoever D. whomever
10. troubles me is I can"t learn all these English idioms by heart.
A. That, that B. What, what C. That, what D. What, that
答案:
A. 1. that 2. what 3. what, whether 4. that
5. who 6. why 7. that 8. which
9. where 10. whatever
B. 1-5 CABBB 6-10 ACACD
（5）同位语从句
1． 定义：用作同位语的从句叫做同位语从句。
2． 用法：同位语从句的先行词多为fact, news, idea, thought, question, reply, report, remark等，关联词多用从属连词that。如：
They were all very much worried over the fact that you were sick. 对你生病这件事，他们都很焦虑。
Where did you get the idea that I could not come?
你在哪儿听说我不能来？
Early in the day came the news that Germany had declared war on Russia. 德国已对俄国宣战的消息一大早就传来了。
注：同位语从句偶尔由从属连词whether引导。如：
I have no idea whether he’ll come or not. 我不知道他是否来。
连接代词who, which, what和连接副词where, when, why, how亦可引导同位语从句。
The question who should do the work requires consideration.
谁该干这项工作，这个问题需要考虑。
We haven"t yet settled the question where we are going to spend our summer vacation.
到哪儿去度暑假，这个问题我们还没有决定。
It is a question how he did it.
那是一个他如何做了此事的问题。
解释：
1．that引导的同位语从句与定语从句之区别
that引导的同位语从句
that引导的定语从句
that只起连接从句的作用，无意义。在从句中不充当句子成分。不可省。 that替代先行词在从句中不仅起连接作用，还充当一个句子成分。如在从句中作动词的宾语时可省略。
意义上
从句是被修饰名词的内容。
从句起限定作用，是定语
如：The news that Mr. Li will be our new English teacher is true. (同位语从句，that不可省。)
李先生将是我们的新英语老师这个消息是真的。
The news (that) he told me yesterday is true. (定语从句，that在从句中作told的宾语，可省。)
他昨天告诉我的消息是真的。
2．一些表示“建议、命令、要求”的名词后所跟的同位语从句中，谓语动词用虚拟语气should+动词原形表示。should可省。如：
This is our only request that this (should) be settled as soon as possible. 这就是我们唯一的请求：尽快解决这个问题。
测试：
A. 用适当的连接词填空：
1． It worried her a bit her hair was turning gray.
2. I have no idea we can do with these waste materials.
3. the doctor really doubts is my mother will recover from the serious disease soon.
4. It is hoped nature will never be destroyed.
5. do you guess will give a talk on English tomorrow?
6. ---- I drove to Zhuhai for the air show last week.
---- Is that you had a few days off?
7. Word came I was wanted at the office.
8. Do you know of them will be our new headmaster?
9. The teacher didn"t tell me we were wrong.
10. It"s generally considered unwise to give a child he or she wants.
B. 单项选择：
1． It was true Alice did surprised her mother.
A. that B. what C. that, what D. what, that
2. Does matter much he can"t come to the meeting.
A. it, if B. that, if C. it, whether D. this, whether
3. ----What are you anxious about? ---- .
A. How can we succeed B. Whether we can succeed
C. When can we succeed D. That we can succeed
4. The reason the little actress has been such a success is she is both clever and hard-working.
A. why, why B. why, that C. that, because D. for, because
5. leaves the room last ought to turn off the lights.
A. Who B. Whoever C. Anyone D. The person
6. I really don"t know ____________ I had this photo taken.
A. where it was that B. it was that C. where it was D. it was why
7. Dr. Black comes from either Oxford or Cambridge. I can"t remember .
A. where B. there C. which D. that
8. ----What do you think of China? --- different life is today from it used to be.
A. How, what B. What, what C. How, that D. What, that
9. Give this to you think can do the work well.
A. who B. whom C. whoever D. whomever
10. troubles me is I can"t learn all these English idioms by heart.
A. That, that B. What, what C. That, what D. What, that
答案:
A. 1. that 2. what 3. what, whether 4. that
5. who 6. why 7. that 8. which
9. where 10. whatever
B. 1-5 CABBB 6-10 ACACD
篇三:[语法英语]初中英语语法复习课件
英语语法贯穿英语学习的始终，尤其是在中考备考复习中，小编收集了初中英语语法复习课件，欢迎阅读。
九种基本时态
一、一般现在时
概念：
表示经常发生的动作或经常存在的状态。常和 always , often , usually , sometimes , every day 等表时间的状语连用。
如：
1) I go to school every day . 我每天都去学校。(表经常)
2) He is always like that . 他总是那样。 (表状态)
构成：
1) 主语 + be (am / are / is ) +……
2) 主语 + 实义动词 + …
二、一般过去时
概念：
1) 表示过去某个时间发生的动作或存在的状态。常和表示过去的时间状语连用。如：yesterday , last week , in 1998 , two days ago等。
如：
I went to a movie yesterday. 我昨天去看了一场电影。
2) 也可表示过去经常或反复发生的动作。
如: He always went to work by bike last week.
构成：
1) 主语 + be (was / were ) +……
2) 主语 + 实义动词过去式 +…
三、现在进行时
概念：
表示现在(说话瞬间)正在进行或发生的动作。
如：
He is singing.They are watching TV now.
构成：
主语 + 助动词be(am/are/is) + 动词-ing形式构成.
四、过去进行时
概念：
表示过去某一时刻或某一段时间正在进行的动作。 这一特定的过去时间除了有上下文暗示外，一般用时间状语来表示。
如：
1) ---What were you doing?
---I was jumping.
2) ---What was the boy doing when the UFO arrived?
---He was sleeping.
构成：
主语 + 助动词be(was/were) + 动词-ing形式构成.
五、一般将来时
概念：
表示现在(说话瞬间)正在进行或发生的动作。
如：
He is singing.They are watching TV now.
构成：
主语 + 助动词be(am/are/is) + 动词-ing形式构成.
六、过去将来时
概念：
表示在过去将来的某一时间发生的动作或存在的状态。
构成：
1) 主语(第一人称) + 助动词should + 动原 +…
2) 主语 + would + 动原 + ….
3) 主语 + was/ were going to +动原…
用法：过去将来时除了上下文暗示外，一般常用在间接引语中，主句谓语动词为过去时态。
如：
1) I should go.
2) You knew I would come.
3) They were going to Naning.
七、现在完成时
构成：
主语 + 助动词 ( have / has ) + 动词过去分词 +…
用法：
表示过去发生或已经完成的动作对现在造成的影响或结果
如：
---Have you had your lunch yet?
---Yes, I have. (现在我不饿了。)
八、现在完成进行时
概念：
表示从过去某一时间开始持续到现在的动作。这一动作可能是刚刚开始，也可能仍在继续，并可能延续到将来。
构成：
主语 + 助动词 (have / has ) + been + 动词-ing +…
如：
1) I have been sitting here for an hour.
2) She has been collecting stamps for about 6 years.
九、过去完成时
构成：
主语 + 助动词 had + 动词过去分词 +…
用法：表示过去在过去某一时间或动作之前已经发生或完成了的动作。它表示的动作发生的时间是”过去的过去”。表示过去某一时间可用by，before 等构成的短语，也可用when，before，等引导的从句或者通过上下文表示。
如：
I had finished my homework when my mom came back home.
三大从句
一、宾语从句
宾语从句是指在一个句子中充当宾语的句子。
例如：
He said that he wanted to be a teacher when he grew up.
他说长大后想当一名老师。
①宾语从句的连接词：
宾语从句的连接词包括that、if/whether(是否)、特殊疑问词。
②宾语从句的语序：
A. 宾语从句的连接词后加陈述语序(主语在前，谓语在后)。
例如：I want to know if he can come tomorrow.
我想知道他明天是否能来。
B. 当连接词本身又是宾语从句的主语时，后面直接加谓语动词。
例如：She asked me who had helped him.
她问我谁帮助了他。
③宾语从句的时态，只要记住以下口诀即可：“主现则从任，主过则从过，客观真理一般现”
A. 主现则从任：主句如果是一般现在时，则从句根据时间状语需要从八种时态中任选一种。
例如：1.He tells me he studied English in England last year.
他告诉我他去年在英国学习英语。
B. 主过则从过：主句如果是一般过去时，则从句根据时间状语需要从四种带“过”字的时态中任选一种，带“过”字的时态分别是如：一般过去时，过去进行时，过去将来时，过去完成时。
例如：He told me that he liked playing football.
他告诉我他喜欢踢足球。
C. 客观真理一般现：客观真理永远用一般现在时。
例如：He said the moon goes around the earth.他说月亮绕着地球转。
二、状语从句
1. 时间状语从句：
在一个句子中作时间状语的句子。
时间状语从句的连接词：when(当…...时候)，while(当...…时候) as(当...…时候)，after(在…...以后)，before(在...…以前) as soon as(一...…就......)，since(自从...…到现在)，till/until(直到…...才......)，by the time(到...…的时候)
例如：
Mozart started writing music when he was four years old.
莫扎特四岁时开始创作音乐。
2. 条件状语从句：
在一个句子中作条件状语的句子。
条件状语从句的连接词：if， unless(除非)，as long as(只要)
例如：If it doesn’t rain tomorrow， we will go hiking.
如果明天不下雨，我们将去远足。
注意：在时间和条件状语从句中，一定要符合“主将从现”原则。如上面例句，条件状语 If it doesn’t rain tomorrow用一般现在时，主句we will go hiking用一般将来时。
3. 原因状语从句：
在一个句子中作原因状语的句子。
原因状语从句的连接词：because， since， as，now that
例如：I didn’t go to school yesterday because I was ill.
因为我生病了，所以昨天没去上学。
三、定语从句
定语是指在句子中用来修饰名词、代词的成分。
例如：I will give my teacher a bunch of beautiful flower.(beautiful是定语)
我给我的老师一束漂亮的花。
定语从句是指在一个句子中作定语的句子，定语从句要放在所修饰的词后。
例如：I have met a doctor who is in the No.1 hospital.
我认识了一位第一医院的医生。
定语从句的关系词：
关系代词：who、which、whom、whose、that
关系副词：when、where、why
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