A and B分为以下四种情况：
Li Ming and Zhang Hua are good students.
Both the parents and the children are here.
A journalist and author lives in the sixth flat.
The turner and fitter is under twenty-five.
iii. And连接几个单数主语，主语由each、 every、 no、 many等词修饰的时候，谓
Each boy and each girl is invited.
Every boy and girl is invited.
No boy and no girl is there now.
A law and rule about protecting environment has been drawn up.
Bread and butter is nutritious.
b) 由or, not only……but also……, either……or……, neither……nor……连接主语时，谓语的人称和数与靠近的主语一致（注意，叙述句和疑问句随语序不同而不同）
Either you or I am mad.
Neither you nor he is naughty.
Not only the farmer but also his family were friendly to me.
c) 当主语后跟有with, along with, together with, besides, except, like, including, as well as, rather than等词的时候，谓语动词不受词组的影响，仅和主语保持一致
All but one were here just now.
A library with five thousand books is offered to nation as a gift.