what从句作主语,如果表示的是单数意义,则谓语动词用单数形式；如果表示的是复数意义,则谓语动词用复数形式
（what）从句作主语,谓语动词用单数形式
两个（以上的）并列的从句作主语,谓语用复数；
不定式作主语,谓语动词用单数形式
两个（以上的）并列的不定式作主语,谓语用复数；
动名词作主语,谓语动词用单数形式
两个（以上的）并列的动名词作主语,谓语用复数；举例子好吗What I want to see is your manager.When and where we will go has not been decided.How we can finish the job and when they will come to help us to do the job are what we should consider.Getting up early is not an easy job.Getting up early and doing some exercises are what we should do in the morning.To see is to believe.