★总结：在名词作主语时，the number of 谓语动词单数形式;

　　几分之几，谓语单数形式;

　　both 谓语使用复数形式。

2、主语是不可数名词、不定式或动名词词组、从句时，谓语动词用单数形式。

　　All the money he received was given to his mother.

　　Forgetting the past means betrayal.

　　What we are talking now is useless.

3.主语部分若有as well as， with， together with， like， but， except等短语，谓语动词的单、复数与短语前面的名词一致。

　　Mary， as well as her two sisters， is a student of this school.

　　(as well as her two sisters 作主语Mary的主语补足语，主语 Mary 是单数，所以谓语动词用单数形式)

　　No one except my friends knows anything about it.

4.表示时间、距离、重量、价值等的复数名词作主语时，如果当作整体看待，谓语动词用单数形式。“…+(×)…=…”算式中的谓语动词也用单数形式。

　　Three times two is six.

　　Three kilometers is 3，ooo metres. (three kilometers作为整体来看)