1. 定语从句中谓语动词是含有介词的动词短语时,介词应放在动词之后,不能拆开放在关系代词前。例如: This is the key which you are looking for. This is the baby whom you will look after. 2. 该结构中,关系代词指人时用whom,指物时用which. 四、弄清as 和which 引...