精选优质文档-倾情为你奉上“介词+关系代词”引导的定语从句“介词关系代词”既可以引导限制性定语从句,也可以引导非限制性定语从句。在此结构中,关系代词指人时用whom,不可用who或that;指物时用which,不能用that;关系代词是所有格时用whose。但如果介词后置,则不受这种限制,关系代词还可以省去,尤其在口语中。如:1) Do you know the girl to whom our teacher was talking? = Do you know the girl (that/who/whom) our teacher was talking to?2) The school (that/which) my brother once studied in is very famous.= The school in which my brother once studied is very famous. 要确定关系代词前用什么介词,可以根据:(1)定语从句中动词和什么介词搭配(2)先行词常和什么介词搭配。如:My