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语法点滴：it句型大扫描 语法从小点抓起 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。 It was about 600 years ago that the first clock with a face and an hour hand was made. It was they that (who ) cleaned the classroom yesterday. It was in the street that I met her father. 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 notuntil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 didnt realize she was a famous film star until she took off her dark glasses. 3. It is clear ( obvious， 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。 | 
