that后面是一个句子，这个句子主谓宾齐全，he said that he went to school yesterday on time
what常常充当后面从句的一个成分如she asked what did you （eat\say \ think\###￥%￥%￥￥%￥）yesterday 从句的谓语动词必须是及物动词给分吧呵呵
that 可以省略。what不能省略，看看省略后句子通顺不，不通顺缺少成分用what，否则用that，多简单
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