We use it to talk about events that started in
the past and are somehow connected to
the present.To create the present perfect tense of any verb,
you will combine the present tense of the verb "to have" plus
the past participle of the main verb of the sentence.
The past participle of a regular verb is the base
word plus –ed. One example of this tense is: "have jumped.
" "Have" is the present tense and "jumped" is the past participle.
To begin with, we tell you that the essential structure of this verb tense is:
Subject + auxiliary HAVE or HAS + main verb (past participle)(-ed) + complement.
Now we'll explain it in additional detail:
1. Auxiliary HAS and HAVE:
For this tense it's always necessary to use the auxiliary HAVE. during this context,
this auxiliary doesn't mean HAVE but HAVE..
Positive - Negative- Interrogation way
Affirmative: we use the HAVE form of the auxiliary.
They have bought the movie
Negative: we can use the long form (HAVE NOT) or the short one (HAVEN'T).
I haven't swum in a river
Interrogative and short answer: we use HAVE before the subject.
Have you slept for more than 3 hours?
Yes, I have or No, I haven't.