名词性从句、动名词短语或动词不定式短语作主语时，谓语用单数形式。
（1）名词性从句或名词性的短语作主语时，谓语用单数形式
a. Children’s interfering in their parents’ right to remarry has become a social problem. （主语是动名词复合结构）
b. When I can complete the work is still unclear.
c. What I said and did is of no concern to you.
d. How close parents are to their children______a strong influence on the character of the children.
A.have
B.has
C.having
D.to have
正确答案：B。
（2）定语从句中的主谓一致
请认真比较下列例句：
a. One of those men likes to drive fast.
b. He is the only one of those men who likes to drive fast.
c. He is one of those men who like to drive fast.
d One of those men who like to drive fast is her. son.
可见，定语从句中的谓语形式应与先行词的单复数形式保持一致。若先行词为单数形式，那么从句谓语也用单数形式，如b句；若先行词为复数形式，那么从句谓语也用复数形式，如c，d句。