This module introduces the present perfect tense, which consists of a helping verb and a past participle.
To form the present perfect, we use “to have” + a verb in the past participle. In some cases, the simple past 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)
write – wrote (simple) – written (participle)
fly – flew (simple) – flown (participle)
The same rules apply when formulating questions:
Examples:
Have you fallen?
Has she forgotten?
Have I mentioned it?
Have we thought about it?