The present perfect tense is used to describe actions that happened at an unspecified time in the past and have relevance or effect in the present. It can also express actions that started in the past and continue into the present.
Composition:
Affirmative: subject + has/has + past participle
Negative: Subject + has/has + not + past participle
Interrogative: What is/are + subject + past participle?
Examples:
Affirmation:
I have visited London.
He has completed his homework.
He has seen that movie.
Cons:
I didn’t go to London.
He hasn’t finished his homework.
We haven’t seen that movie.
Inquiry:
have you been to london
Has he finished his homework?
Have they seen that movie?
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