这句话的主句和从句怎么分，这里是that引导从句还是who引导。

主句从哪里到哪里从句从哪里到哪里The first person who opens that door will get a shock. 这里的that有什么用为什么不改成opens the door。 请大家帮忙解决一下

the first person will get a shock 是主句，who opens that door 为定语从句。是who 引导的定语从句，这里的that 不是引导词，是指那扇门，不能用the 希望对你有用。

The first person是主语，who引导从句，that door是指“那扇门”，will get是谓语，a shock是宾语~！

1 is he the person who is going to teach us?

2 why are you going to a fitness class which/that makes you very tired?

3 the boy ,whose photos i like best, is by the window,,

4 the exercises which/that i do are very difficult.

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