定语从句有些时候规定用that 是不是在从句中做宾语或主语的时候才用that啊.

1.当先行词为anything,everything,nothing等不定代词时,只能使用“that”.例：Is there anything that I can do for you?(我能给你做点什么吗?)　　2.当先行词为all,any,much,many词时,只能使用“that”.例：Tom tol...