present perfect vs. simple past 2 periodo

 Notes:

1. The written lesson is below.
2. Links to quizzes, tests, etc. are to the left.

The present perfect is formed by combining the auxiliary verb "has" or "have" with the past participle.I have studied.

He has written a letter to María.
We have been stranded for six days.

Because the present perfect is a compound tense, two verbs are required: the main verb and the auxiliary verb.

I have studied.
(main verb: studied ; auxiliary verb: have)

He has written a letter to María.
(main verb: written ; auxiliary verb: has)

We have been stranded for six days.