高二英语语法知识点归纳--it
十几年前，社会上就流传着这样一句话：未来几年人类必须掌握的三大技能是英语、驾驶、计算机。下面为大家推荐了高二英语语法知识点，请大家仔细阅读，希望你喜欢。
It”用法及其句型和固定搭配讲解
“It”用法及其句型和固定搭配，是高中英语语法的重点、难点，因此应给予充分的重视，今天我们就为大家归纳一下it的用法归纳一下
一it用作实词
表达以下概念：指代前文提到的事物，前文中的this，that;替代前文中的内容;指代一位性别不明的小孩或未知的人;指代未指明但谈话双方都知道的那件事;指代时间、天气、气候、距离等自然现象。
二it作形式主语
it替代作主语的从句、动词不定式、动名词，而把真正作主语的从句、动词不定式、动名词置于句尾。
1. it作形式主语代替从句的句型：
(1) It+be+名词词组+that从句。
例：It’s a wonder that you could finish the hard task in such a short time.
(2) It+be+adj. +that从句
It is/was surprising(important, desirable, advisable…) that…。在这个句型中，从句的谓语动词常用虚拟语气，即“should+动词原形”或“should have+过去分词”。
例：It’s important that you should apologize to her for your rudeness.
It’s strange that he should have gone away without telling us.
(3) It+v.+sb.+that从句
It+surprise/delight/interest/disappoint/worry/disturb/annoy/amaze /bother/frighten/please/anger sb.that…
例：It worried me that she drove so fast.
(4) It is/was desired(suggested, settled, proposed, requested, decided…) that…。在这个句型中，从句的谓语动词常用虚拟语气，即“(should)+动词原形”。
例： It was requested that the play should be put on again.
(5) It+be/seem+adj.(good, true, wonderful, wrong, clear, possible, certain…)+that从句
例：It is likely that they will beat us tonight.
2. it作形式主语代替不定式的句型：
(1) It+be+adj. (for sb.) to do sth.
此处adj. 通常为描述事件的形容词：easy, difficult, hard, necessary, unnecessary, possible, impossible, likely, unlikely, right, wrong, important, unimportant, legal, illegal, well-mannered, ill-mannered, polite, impolite, clear, obvious, certain, suitable, proper, fit, useful, useless, dangerous…
例：It is illegal (for a teenager) to drive a car without a license.
(2) It+be+adj.+of sb. to do sth.
此处adj. 通常为描述人的形容词：kind, unkind, nice, rude, cruel, considerate, thoughtful, thoughtless, careful, careless, silly, foolish, stupid, clever, wise, crazy…
例：It’s kind of you to help me with the problem.
3. it作形式主语代替动名词的句型：
It’s no good/use doing…
It’s (well) worth doing…
It’s (well) worthwhile doing…
例：It’s no use crying over spilt milk.
三it作形式主语的句型
1. It takes sb. some time to do sth.某人用多长时间做某事
It took the men a week to mend our roof.
2. It’s (about/high) time that…是该做某事的时候了
It’s(about/high) time that we should take action.
3. It’s the x-th time(that)…第几次做某事了
It’s the third time that he has failed the driving test.
四it作形式宾语的常见句型
1. verb+ it+ adj./noun (for/of) to do/clause(verb=think, believe, suppose, consider, feel, make, keep…)
例：I think it hard for you to do the task on your own.
I think it hard that you’ll do the task on your own.
2. verb+it+adj./noun (one’s) doing
(verb=think, believe, suppose, consider, feel, make, keep…)
(adj.=useless/worth/worthwhile)
(noun=no use/no good/worth one’s while/a waste of time/money/energy/words)
例：I’ll make it worth your while telling me about his secret.
3. verb+it+ important/unimportant/necessary/unnecessary/natural/essential that … (should)…
(verb=think, believe, suppose, consider, feel, make, keep…)
例：I think it important that you (should) attend the conference.
4. verb + it+ as+ noun/adj.+ clause (verb=accept, regard, take, see, view)
例：The lecturer takes it as encouraging when so many students attend his lecture.
五强调句型
强调句型用来强调谓语动词以外的任何句子成分。其基本结构是：It is/was+被强调部分+that(强调部分是人时也可以who)+其他成分。
在使用强调句型时需注意以下几点：
1. 强调句型的特殊疑问句：被强调部分(通常是疑问代词或疑问副词)+ is/was+it+that/who+其他部分?
例：When was it that he changed his mind to take part in the activity?
2. 在强调原因状语从句时，只能强调由because引导的从句。
例：It was because he was ill that he didn’'t come to school yesterday.
3. 在强调not…until结构时必须把not与until一起放到被强调的位置上。其结构是：It is/was not until+被强调部分+that+其他部分。
例：It was not until she took off her dark glasses that I realized she was my sister.
4. 注意强调句型与定语从句的区别
例：It was at 7 o’clock that he came here yesterday. ( 强调句型)
It was 7 o’clock when he came here yesterday. (定语从句)
六It 常用的固定搭配
1. make it
(1) 在口语当中相当于succeed，表示“成功，做到，赶上，及时到达”。
例： No matter how hard it is, I will make it one day.
(2) 在口语中相当于fix the date for，表示“约定好时间”。
例：— Shall we meet next week?
— OK. We just make it next Saturday.
2. as it is
(1) 相当于in fact，in reality表示“事实上，实际上”。
例：We had planned to finish the task today, but as it is we probably won’t finish it until next week.
(2) 相当于方式状语从句，表示“照原样”。
例：Leave the table as it is.
3. That’s it.
(1) 相当于That’s all. That’s so much.表示“至此为止，没有别的了”。
例：You can have one more sweet, and that’s it.
(2) 相当于That’s right.表示“对啦”。
例：— I guess the key to the problem is the choice “A”.
— That’s it.
4. have it
(1) 相当于say，insist表示，“说，主张，表明”。
例：Rumour has it that they are getting divorced.
(2) 相当于get to know something，表示“了解，知道，获悉”。
例：I had it from John that Jane was going abroad.
5. Keep at it!
相当于go on，表示“继续做，不放弃”。
例：My teacher asked me to keep at it.
6. as it turned out表示“最后被证明是”
例：As it turned out, his statement was false.
7. Take it easy.
相当于Don’t worry.用来劝告别人，表示“不要慌，别担心”。
例：Take it easy! He will do it well.
8. believe it or not表示“信不信由你”。
例：Believe it or not, Tom is getting married to Mary next Sunday.
9. Take it or leave it.要么接受要么放弃。
例：That is my last offer. You can take it or leave it.
10. It all depends.
在口语中，相当于It hasn’t been decided yet.表示“那得看情况，还没有定下来”。
例：— Are you going to the countryside for holiday?
— It all depends.
11. It’s up to sb.
在口语中，相当于It’s decided by sb.表示“由……决定，由……负责，取决于……”。
例：— Shall we go out for dinner?
— It’s up to you.
育路小编为大家提供的高中英语语法知识点，大家仔细阅读了吗?最后祝同学们学习进步。
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