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Positive statements


SingularPlural
1st personI have eaten ..we have eaten ..
2nd personyou have eaten ..you have eaten ..
3rd personhe/she/it has eaten ..they have eaten ..

Negative statements


SingularPlural
1st personI haven't eaten ..we haven't eaten ..
2nd personyou haven't eaten ..you haven't eaten ..
3rd personhe/she/it hasn't eaten ..they haven't eaten ..

Questions


SingularPlural
1st personhave I eaten .. ?have we eaten .. ?
2nd personhave you eaten .. ?have you eaten .. ?
3rd personhas he/she/it eaten .. ?have they eaten .. ?

Note that the third form of the verb is used in all forms of the present perfect.

Back to the explanation of the uses of the present perfect.