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? |