It用法总结知识讲解

这成一样个一完个整不的完句整子的，句只是子没；被第强二调句,而是其强他调 句从 比句较，一：th般at不不具可备改这为一w特he征n。．
1) It was ten o'clock when we got home last night．我们昨晚到家时已十点了。 2) It was at ten o'clock that we got home last night．我们昨晚是在十点到家的。
㈠ 1.it作人称代词
1.1.it的最基本用法是作人称代词，主要指刚提到 的事物，以避免重复: Ningbo is a beautiful city, isn’t it?
1.2.也可以指动物或婴儿(未知性别的婴儿或孩子): Is this your dog？No, it isn’t.
1.3.也可指抽象事物: It was a great surprise to me when he did a thing like that．
2.3.指环境: It was very quiet in the café.
2.4.指距离： It is half an hour’s walk to the city centre.
㈡.引导词it 1. It is + 被强调部分 + that ...
使用该句型有以下几点请注意： ① 强调句的谓语is或was永远用单数.
2. It is not until + 被强调部分 + that ... 该句型也是强调句型。主要用于强凋时间状 语，译成汉语＂直到．．．才．．．＂，可 以说是 not ... until ... 的强调形式。 It was not until she took off her dark glasses that I realized she was a famous film star. = Not until she took off her dark glasses did I realize she was a famous film star. = I didn’t realize she was a famous film star until she took off her dark glasses.
3.2.作形式主语替代不定式
1). It takes sb. ... to do sth. ＂做．．．要花费某人．．＂ It took thousands of people many years to build the Great Wall.
2). It is kind ( of sb. ) to do sth. 主句中的形容词必须是能表示逻辑主语特征的形容词。 常见的有： bad ， brave ， careless， clever ， cruel ， foolish ，stupid ， wise wrong等。 这个句型可以改写为：sb. is kind to do sth. 。 It is kind of you to say so. = You are kind to say so.
It was yesterday that I met your father in the street．
②不管被强调部分是哪种状语，只能用 that连接，不得使用where、when等连词.
It was in the street that I met your father yesterday．
2.非人称代词it
it有时并不指具体的东西，而泛指天气、时间、环境等， 称为非人称的it： 2.1.指天气： It is a lovely day, isn’t it? It is a bit windy.
2.2.指时间: It was nearly midnight when she came back.
④强调句中 也要注意主谓一致、人称一致和否定转移 的问题。
It is they who are our friends． It was not until ten o'clock that we got home last night．
要点点拔
第一句不是强调句，when不可改为 ⑤t“w注haaW意st…,e因不tgh要为ao混tt去…h淆为掉om强强ite调调wt句ae句sn和标和o其志'tch他l，aotc从去后k句掉，la。后s只tIt仍n能isi可g组h组t成．”
②. It is important ( necessary， right， strange， natural...) that ... that 后的从句中要用虚拟语气（should + 动词原形）， should 可以省去，建议记住该句型中的形容词。 It is important that we (should) learn English well.
3). It is necessary ( for sb. ) to do sth. 常见的形容词有：① important， necessary， natural ② easy ， safe ，common ，normal ，hard ， difficult ,dangerous ， 等。 在①中的形容词作表语可以用从句改写， 如： It is important for her to come to the party. = It is important that she (should ) come to the party.
③被强调部分为人时，可用who(主格或宾格)和 whom(宾格)代替that，用that也行。
1) It was your father that/whom /who I met in the street yesterday．
2) It was I that/who met your father in the street yesterdபைடு நூலகம்y．
3. it 用作形式主语
3.1 代替主语从句
1）It is + adj. +that从句
① It is clear ( obvious， true， possible certain....) that ..... “清楚（显然，真的，肯定．．．）”
It is very clear that he’s round and tall like a tree.