为什么He'll do what he can to study hard.这句话中What 不可以改成that

为什么He'll do what he can to study hard.这句话中What 不可以改成that I'll question him about what he was doing yesterday为什么不能说I'll question him about what he did do yesterday? He ll tell you what to do 是什么从句? what he should do He'll do what he can to study hard.这句话是什么从句,what可不可以改为that he'll use what he has (to buy)her a new dress.为什么不是bought He'll neve rlove you like do What does he do when he works What does he he usually do on sundays?为什么这里用does/而不用do? He has no time to do what he likes为什么用to do What does he do 还是What job does he do? what does he------[do/doing]? What does he do then What did he do yesterday? what could he do?中文 what does he do?翻译 do you know what he eats?和do you know what he eating?哪个句子对?为什么? learn to do what he told和learn to do what he told them 那个对?为什么?