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.
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．
2.2.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 t-o the city centre.
三 强调句1. It is + 被强调部分 + that ...
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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) 2) It was I that/who met your father in the street yesterday．
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四 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.
3) 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。
4)
It is they who are our friends． 5) It was not until ten o'clock that we got home
last night．
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要点点拔
第一句不是强调句，when不可改为 that,因为去掉it was和that后，只能组成 ⑤“这w成注a一W样意s…个e一不t完gh要个ao整混tt不…h的淆为o完句m强强整子e调调的，t句e句句n只和标o是子其志'c没；他l，o被从c第去k强句二掉la调。后s句,tI而t仍是nis其i可g强h他组t调．” 句从句，一th般at不不具可备改这为一w特he征n。．
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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: Tai’an 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. 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.
主句中的过去分词是表示请求，建议，命令等词时，that 后的从句要用虚拟语气（should + 动词原形），should 可以省；常译为“据建议；有命令．．．）
C 确认某人为何人 Her face lighted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.
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2）.It is +v-ed +that 从句 ① It is said (reported， learned....) that ...
据说（据报道，据悉．．．）“。 It is said that he has come to Beijing.
②. It is suggested ( ordered /demanded/insisted/commanded... ) that ...
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㈠ 1.it作人称代词
1.4.it 指未知的人。 A 有人敲门 There’s a knock at the door. Who is it? It’s the milkman. B 在电话里 “Oh, by the way, there was telephone call for you?” –Who was it?
比较： 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。
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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.