關系詞只能選用that

① 當先行詞為不定代詞 something, anything, nothing, everything時

Is there anything that I can do for you?

② 當先行詞為不定代詞all時

Mr. Li does all that he can to do his work well.

③ 當先行詞被all, some, any修飾時

These are all the things that I have done today.

④ 當先行詞被the only, the very 修飾時

This is the only computer that he often turns to for help.

⑤ 當先行詞被序數詞，形容詞最高級修飾時

This is the cleaning room that you can see here.

⑥ time 作先行詞，前面有序數詞或last修飾時

This is the last time that I’ll give you pocket money.

⑦ 盡管先行詞指人，但關系詞在句中作表語時。

He is no longer the child that he used to be 20 years ago

⑧ 以 who開頭的特殊疑問句，盡管先行詞指人。

Who is the person that is sitting on the ground ?

⑨ 當先行詞包括人和物時。

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