宾语从句中关系代词that 的用法(初三的水平,尽量答得通俗易懂些）谢谢

关系代词的用法
(1) 如果先行词是all,much,anything,something,nothing,everything,little,none等不定代词,关系代词一般只用that,不用which.例如：All the people that are present burst into tears.
(2) 如果先等词被形容词最高级以及first,last,any,only,few,mush,no,some,very等词修饰,关系代词常用that,不用which,who,或whom.例如：(3) 非限制性定语从句中,不能用关系代词that,作宾语用的关系代词也不能省略.例如：
There are about seven million people taking part in the election,most of whom、are well educated.
(4) which还有一种特殊用法,它可以引导从句修饰前面的整个主句,代替主句所表示的整体概念或部分概念.在这种从句中,which可以作主语,也可以作宾语或表语,多数情况下意思是与and this 相似,并可以指人.