1it用法及引导的重点句型(精)

1)He didn’t come because he was ill. It was because he was ill that he didn’t come. 2) She didn’t go to bed until her father came back. It was until her father came back that she didn’t go to bed. (wrong) It was not until her father came back that she went to bed. Not until her father came back did she go to bed.
强调句型 It + be +被强调部分 + that/who从句 I met Tom in the park yesterday. 1) It was I who met Tom in the park yesterday.
2) It was Tom who I met in the park yesterday.
3) It was in the park that I met Tom yesterday. 4) It was yesterday that I met Tom in the park. It was five o’clock _________I when got home. It was at five o’clock_______ that I got home.
㈡.it的重要句型
1. It is + 被强调部分 + that ... 该句型是强调句型。将被强调的部分放在 前面，其它部分置于that之后，被强调部分 可以是主语，宾语，表语或状语，强调的主 语如果是人，that可以由who换用。如果把 这种句型结构划掉后，应该是一个完整无缺 的句子；这也是判断强调句型与其它从句的 方法。
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. 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. 3.it的其他用法 3.1.表示谁在做某事的句子： Who is it? ---It’s me. Her face lighted when she saw who it was. 3.2.用来泛指某件事： So you are going to be married this time？When is it？ It doesn’t matter. It is a shame, isn’t it?
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.
4. It is important ( necessary， right， strange， natural...) that ... 该句型和上一个同属一个句型；由于主句中的形容词 不同，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. It is necessary that he (should) remember these words.
5. It is said (reported) that ... 该句型中的it 仍是形式主语，真正主语是that 引导的主语从句；该结构常译为＂据说（据报 道，据悉．．．）＂。 It is said that he has come to Beijing. It is reported that another earth satellite has been put into orbit.
源自文库
3. It is clear ( true， possible， certain....) that ..... 该句型中it 是形式主语，真正的主语是that 引 导的主语从句，常译为＂清楚（显然，真的， 肯定．．．）＂ 是主语从句最常见的一种结 构。 It is very clear that he’s round and tall like a tree. = That he’s round and tall like a tree is very clear.
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．