Grammar: Present Perfect Tense

Forming the Present Perfect

The present perfect of any verb is composed of two elements: the appropriate form of the auxiliary verb to have (present tense), plus the past participle of the main verb. The past participle of a regular verb is base+ed, e.g. played, arrived, looked.  

Examples: to walk

Affirmative Negative Interrogative
I have walked I haven’t walked Have I walked?
You have walked You haven’t walked. Have you walked?
He, she, it has walked He, she, hasn’t walked Has he, she, it walked?
We have walked We haven’t walked Have we walked?
You have walked You haven’t walked Have you walked?
They have walked They haven’t walked Have they walked?

(See Appendix V)