I don't understand _what___ __the__ _teacher____ __says___ in class.He asked me __how___ __long__ __it___ __took____ me to go to beijing by train.Would you tell me __which___train __I__ __should __ ...I don't understand _what___ __the__ _teacher____ __says___ in class.这句的say 可以用talks吗不可以用talks，因为talk是不及物动词，通常不能直接带宾语。简单地说，英语里有say something，但没有talk something，正确的是 talk about something。这个句子的 what the teacher says 大致相当于 what the teacher talks about