从句 主语，宾语，
表语 齐全了，成分就完整了。
What he said is right. 从句what he said, 主语he, 谓语said, 宾语what
I think that you are right. 从句that you are right. 主语you, 谓语are, 表语 right
I don't know ________ he lives. 从句_____ he lives, 主语he, 谓语lives, 不及物，不需要宾语，
所以该从句结构完整， 不能填 who, whom, what, which之类能做 主语宾语，表语成分的。
I don't know _____ he said. said 是
及物动词，后面少宾语， 所以填what
追问请问We were very excited at the news that our team had won..这个句子为什麽用that引导啊...won不是及物动词吗
追答our team had won 我们队赢了， 并不少成分， win可以做不及物动词。