不需要.这是非谓语动词做宾语.动名词\不定式中的动词形式不变.也就是说，三单句子中不是谓语的动词不用变三单？Yes.you are right!除此外，宾语从句也是？宾语从句不同.如:I think she is a teacher./I think you are a teacher.I know she lives in the city./I know you live in the city.宾语从句的谓语动词要以人称变化而变.