it句型大扫描
一、强调句型
1. 陈述句的强调句，强调陈述句中的某个成分。
为了强调句子中的有些成分，要用强调结构it is(was)+被强调部分+that(who)+其他部分。被强调的成分可以是主语、宾语、状语，但不能是定语表语和谓语。这种类型的强调句主要注意一下几个方面：
1）it在这一结构中作主句的主语，所以即使被强调部分是复数名词，也要用is或was。
e.g. tom and mark often come to see me.
it is tom and mark who often come to see me. （强调主语）
2）如果被强调部分是时间、地点、方式或原因也不用when, where, how, why, 而用that；强调人时可用who，也可用that。
e.g.（1）they set out the day before yesterday.
it was the day before yesterday that they set out （强调时间状语）
（2）we put off the sports meet because of the rain.
it was because of the rain that we put off the sports meet
（强调原因状语）
（3）it was because she was ill that they didn’t ask her to do the job. （强调原因状语从句）
3）被强调部分如果是原句的主语，who或that后面谓语的人称和数应和原句的主语一致。
— pers
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