You are waiting for a train,a train that will take you far away.为什么a train后面会有一个that这是什么用法?不用that可以吗

填空：Who are you waiting for =( ) ( )are you waiting? who are you waiting waiting for 有for么 为什么 what are you waiting for 怎么翻译? what the hell are you waiting for what the hell are you waiting for my life are waiting for you who____(其他的)are you waiting for? Are you waiting for a bus?回答 could you tell me ---------?A where are you waiting for B where were you waiting for? could you tell me ---------?A who you are waiting for B who you were waiting for? 翻译一下Hope for happiness are you waiting for me are you waiting for the bus为什么用for who are you ( )herewaitingwait for waiting for wait who are you waiting for同义句______ ______ are you waiting? who are you waiting for?是不是等于 whom are you waiting Where are you? I am waiting for you 判断正误 Who are you waiting for who are you waiting for the bus stop?判断正误Who are you waiting for who are you waiting for the bus stop?who are you waiting for at the bus stop?Who are you waiting who are you waiting at the bus stop?who are Could you tell me_____?A)whom are you waiting B)whom you are waitingA)whom are you waiting B)whom you are waitingC)whom are you waiting for D)whom you are waiting for