To form the negative of a sentence of any other verb in the Present Perfect you need to use the negative form of the auxiliary verb ‘Have’ + ‘not‘ (often contracted to haven't or hasn't )+ the past participle of the verb you want to use, no matter if that verb is regular or irregular:
- Sue has played basketball ==> Sue hasn't played basketball
- His brothers have moved to Australia ==> His brothers haven't moved to Australia
- I have slept for two hours ==> I haven't slept for two hours
- My cousin has earned €250 so far ==> My cousin hasn't earned €300 so far
MIND MAP: Third person singular
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