Present Perfect Negative Statements
To form the negative, simply add "not" after "have" / "has":
- subject + has / have + not + past participle
We can also use the contractions hasn't / haven't (has not = hasn't, have not = haven't)
Examples:
- They haven't come to my house before.
- They have not found the restaurant yet.
- I have not started cleaning yet.
- I haven't heard any noises from our neighbors today.
- Don't worry my dog hasn't ever bitten anyone.
- My cat has not killed any mice.
Further information go to: http://www.learn-english-have-fun.com/present-perfect.html
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