Section_ⅣGrammar_&_Writing

　　语法图解

　　探究发现

　　①It was Mary who did the experiment in the lab yesterday evening.

　　②It was in the park that I met my old teacher yesterday.

　　③It is a pity that you didn't see the film yesterday evening.

　　④It was seven o'clock when we reached the mountain village.

　　⑤It was yesterday that I met my old teacher in the park.

　　⑥It was my old teacher that I met in the park yesterday.

　　⑦Maria, do tell us a little about the Venice Film Festival.

　　⑧It is a good idea that we will have a swim this Sunday.

　　[我的发现]

　　(1)以上句子中，句①②⑤⑥⑦表示强调。

　　(2)上述句子中表示强调时有两种表现形式。一种是用do/does/did＋动词原形表示；另一种是用强调句句型表示。

　　(3)句③中的that引导主语从句，it是形式主语。同样用法还有句⑧。

　　(4)句④中的it是代词；when引导时间状语从句。

　　一、强调的功能和作用

在表达中，强调是对句中的主语、宾语、状语或状语从句进行充分强调而采用的一种特殊的表达结构，强调是一种修辞方法，能起到突出信息的作用。