these are book and ruler 里面里的book和ruler 需要加s吗

问题描述:

these are book and ruler 里面里的book和ruler 需要加s吗

there be 有就近原则,如果是are,book一定要加s,ruler是可数名词没有冠词a的修饰,一定要加s.

有以下说法:
these are books and a ruler .
these are books and rulers
these are a book and rulers
these are a book and a ruler

前面的book一定要加s,因为谓语是are,主谓一致就近原则,谓语are就主语books近,所以要在book的前面加s.如果后面的ruler没有冠词a的话也要加s,加了冠词a的话变成these are books and a ruler.就不用加s了.