宾语从句在句子中充当宾语,通常跟在动词后；定语从句从当定语成分用来修饰名词等.如：I heard (there was a car accident near the station).()中的there was a car accident near the station,就是宾语从句,在句子中充当动词HEARD的宾语.而The accident which happend near the station is the most serious one.中which happend near the station便是定于从句,修饰accident