have的否定句式是don't have还是have no

否定式是haven't.
但也存在have no, 但这不是一种句式.
例:I have no idea. 只不过是表示我没有...并不是它的否定式(可能还是表述得不太清楚...~)

I have a pen.
否：I don't have a pen.

I have been in Nanjing.
否：I haven't been in Nanjing.

就是说，have做实意动词“有，吃”的时候，否定用don't have；
在做助动词时，用have not

don't have
没有have no这种式子

一定是don't have

have是行为动词，变否定式时，要加助动词，如果是三人称单数就是doesn't have,其他就是don't have.

don't have