高中英语语法知识点归纳_英语知识点_精品学习网

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    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. i t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
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  • 2016-04-16