1,what 引导的主语从句作主语时,谓语的数由后面的表语或宾语确定.例如：
What she said is correct.
What he gave me are five English books.
2,其它词引导的名词性从句作主语时,谓语用单数.例如：
Who is responsible for the accidents is not clear.
在主语从句中,主句的谓语动词用单数吗
1,what 引导的主语从句作主语时,谓语的数由后面的表语或宾语确定.例如：
What she said is correct.
What he gave me are five English books.
2,其它词引导的名词性从句作主语时,谓语用单数.例如：
Who is responsible for the accidents is not clear.