the earrings must be a present for his mother语法错误?

问题描述:

the earrings must be a present for his mother语法错误?
课本上的原话,可是前面加s 后面用a?为什么

没错.两个耳环算一个礼物.英语主谓要一致就行.
例如 My favorite food is bananas.bananas.是复数啊,如there are books 为什么用is主语是 food ,谓语是is ,一致就行there are books 主语是books ,谓语是are,一致