语法一致原则
1. 当主语由and连结时,谓语动词一般用复数; 如果表示同一人,物或概念或由两个部件配成的物品时,谓语动词用单数,
The worker and writer ____(be) from Wuhan. The worker and the writer _____(be) from Beijing. One more knife and fork _____ (be) needed.
is
are
What I think and what I do ______(be) fairly in disagreement. My brother and I _____ (have) both been to Beijing.
is
have
are