高二英語語法知識點歸納--it
十幾年前，社會上就流傳著這樣一句話：未來幾年人類必須掌握的三大技能是英語、駕駛、計算機。下面為大家推薦了高二英語語法知識點，請大家仔細閱讀，希望你喜歡。
It”用法及其句型和固定搭配講解
“It”用法及其句型和固定搭配，是高中英語語法的重點、難點，因此應(yīng)給予充分的重視，今天我們就為大家歸納一下it的用法歸納一下
一it用作實詞
表達以下概念：指代前文提到的事物，前文中的this，that;替代前文中的內(nèi)容;指代一位性別不明的小孩或未知的人;指代未指明但談話雙方都知道的那件事;指代時間、天氣、氣候、距離等自然現(xiàn)象。
二it作形式主語
it替代作主語的從句、動詞不定式、動名詞，而把真正作主語的從句、動詞不定式、動名詞置于句尾。
1. it作形式主語代替從句的句型：
(1) It+be+名詞詞組+that從句。
例：It’s a wonder that you could finish the hard task in such a short time.
(2) It+be+adj. +that從句
It is/was surprising(important, desirable, advisable…) that…。在這個句型中，從句的謂語動詞常用虛擬語氣，即“should+動詞原形”或“should have+過去分詞”。
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從句
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…。在這個句型中，從句的謂語動詞常用虛擬語氣，即“(should)+動詞原形”。
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從句
例：It is likely that they will beat us tonight.
2. it作形式主語代替不定式的句型：
(1) It+be+adj. (for sb.) to do sth.
此處adj. 通常為描述事件的形容詞：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.
此處adj. 通常為描述人的形容詞：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作形式主語代替動名詞的句型：
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作形式主語的句型
1. It takes sb. some time to do sth.某人用多長時間做某事
It took the men a week to mend our roof.
2. It’s (about/high) time that…是該做某事的時候了
It’s(about/high) time that we should take action.
3. It’s the x-th time(that)…第幾次做某事了
It’s the third time that he has failed the driving test.
四it作形式賓語的常見句型
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.
五強調(diào)句型
強調(diào)句型用來強調(diào)謂語動詞以外的任何句子成分。其基本結(jié)構(gòu)是：It is/was+被強調(diào)部分+that(強調(diào)部分是人時也可以who)+其他成分。
在使用強調(diào)句型時需注意以下幾點：
1. 強調(diào)句型的特殊疑問句：被強調(diào)部分(通常是疑問代詞或疑問副詞)+ 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. 在強調(diào)原因狀語從句時，只能強調(diào)由because引導的從句。
例：It was because he was ill that he didn’'t come to school yesterday.
3. 在強調(diào)not…until結(jié)構(gòu)時必須把not與until一起放到被強調(diào)的位置上。其結(jié)構(gòu)是：It is/was not until+被強調(diào)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. 注意強調(diào)句型與定語從句的區(qū)別
例：It was at 7 o’clock that he came here yesterday. ( 強調(diào)句型)
It was 7 o’clock when he came here yesterday. (定語從句)
六It 常用的固定搭配
1. make it
(1) 在口語當中相當于succeed，表示“成功，做到，趕上，及時到達”。
例： No matter how hard it is, I will make it one day.
(2) 在口語中相當于fix the date for，表示“約定好時間”。
例：— Shall we meet next week?
— OK. We just make it next Saturday.
2. as it is
(1) 相當于in fact，in reality表示“事實上，實際上”。
例：We had planned to finish the task today, but as it is we probably won’t finish it until next week.
(2) 相當于方式狀語從句，表示“照原樣”。
例：Leave the table as it is.
3. That’s it.
(1) 相當于That’s all. That’s so much.表示“至此為止，沒有別的了”。
例：You can have one more sweet, and that’s it.
(2) 相當于That’s right.表示“對啦”。
例：— I guess the key to the problem is the choice “A”.
— That’s it.
4. have it
(1) 相當于say，insist表示，“說，主張，表明”。
例：Rumour has it that they are getting divorced.
(2) 相當于get to know something，表示“了解，知道，獲悉”。
例：I had it from John that Jane was going abroad.
5. Keep at it!
相當于go on，表示“繼續(xù)做，不放棄”。
例：My teacher asked me to keep at it.
6. as it turned out表示“最后被證明是”
例：As it turned out, his statement was false.
7. Take it easy.
相當于Don’t worry.用來勸告別人，表示“不要慌，別擔心”。
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.要么接受要么放棄。
例：That is my last offer. You can take it or leave it.
10. It all depends.
在口語中，相當于It hasn’t been decided yet.表示“那得看情況，還沒有定下來”。
例：— Are you going to the countryside for holiday?
— It all depends.
11. It’s up to sb.
在口語中，相當于It’s decided by sb.表示“由……決定，由……負責，取決于……”。
例：— Shall we go out for dinner?
— It’s up to you.
育路小編為大家提供的高中英語語法知識點，大家仔細閱讀了嗎?最后祝同學們學習進步。
(責任編輯：彭海芝)
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