<u>Answer</u>:
The tense which relates to an action which either happened previously at an unknown period of time or initiated in the past, and carried to this day is referred as the present perfect tense. It is usually formed by have/has + past participle.
1. My sister <u>has eaten</u> my cakes.
2. The children <u>have lost </u>their passports.
3. Your friend <u>has been </u>happy all day.
4. I <u>have never travelled</u> abroad.
The verbs which are chosen are met, swept, won and known.
The present perfect sentences are
I have met him today.
She has swept this place neatly.
We have never won this competition.
He has known for his success.
