区分what和that、which引导的宾语从句,

问题描述:

区分what和that、which引导的宾语从句,

what 和which都是代词,指物,在从句中还同时承担主语、宾语、定语等成份.其区别在于which有限定范围,what没有.
that只起连接作用,在从句中不充不成分.