Present perfect tense negative exercise - Tenses exercises

Complete the negative sentences with the correct present perfect form of the verbs.
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Do not think it has not happened to anybody else. (happen)
Our marriage has not meant anything. (mean)
The need for a reformed, strengthened global humanitarian system has never been more apparent or necessary. (be)
The lawyer has not considered that. (consider)
Sir, I am aware that I have not done my duty and I respectfully ask your pardon. (do)
We have not identified her yet. (identify)
Well, I hope your ship has not dented its hull. (dent)
Yeah, well, of course, but you have never had your own account? (have)
I mean I have never seen someone so romantic. (see)
I have not told you anything, but I think about it all the time. (tell)
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