

The past participle of a regular verb is base+ed, e.g. 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. Read more about using the present perfect with the words "ever", "never", "already", and "yet", and about using the present perfect with the words "for" and "since".

When the time period referred to has not finishedĪctions repeated in an unspecified period between the past and now.

