ithinkitisinteresting,改为否定句怎么改

I think it is interesting(如何改为否定句)?
I think it is interesting.
这句英语如何改为否定句啊?
试卷上是这样的:I ( ) think it ( ) interesting.
可是我不知道怎么改诶,谁能帮我啊!~

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