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I think she has many friends 变否定句::

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I think she has many friends 变否定句::
我知道否定句是:I don't think she has many friends.我想问一下为什么变否定句后has不变?
孩子,这涉及一个知识点 否定前置.在有宾语同句的句子中,主句谓语如果是think suppose guess 等表示主语想法或者是推断的动词,如果你想要对宾语同句进行否定,需要把not提前.
另外宾语同句的谓语的单三或非单三取决于宾语同句的主语,给你举个例子1.I do not think Tom is a student,2.Tom does not think Jim works hard.如果还不会继续问吧.