一.就近原则
1. 由并列结构或连词(either…or, neither…nor,not…but, not only…but also, or等)连接的并列主语,谓语动词与较近的那个名词或代词保持一致。
Neither his parents nor Tom_____(be) at home.
2. 在倒装句和there be句型中,谓语动词与后面的第一个主语保持一致。
There _____(be) a book and some pens on the desk.
There ______(come) the bus.