To form the Present Perfect 1 we use “to have” + a verb in the past participle. In some cases. the simple present form and the past participle form are the same. These are regular verbs.
Examples: clean – cleaned (simple) – cleaned (participle)
play – played – played (participle)
In some cases, the past participle form of a verb is different from the simple past form. These are irregular.
Examples: drive – drove (simple) – driven (participle)
send – sent (simple) – sent (participle)
fly – flew (simple) – flown (participle)
The same rules apply when formulating questions:
Have you fallen?
Has she forgotten?
Have I mentioned?
Have we thought about it?