THE PRESENT PERFECT TENSE
AFFIRMATIVE
NEGATIVE
INTERROGATIVE
I have worked
I have not (haven't) worked
Have I worked?
He has worked
He has not (hasn't) worked
Has he worked?
She has worked
She has not (hasn't) worked
Has she worked?
It has worked
It has not (hasn't) worked
Has it worked?
We have worked
We have not (haven't) worked
Have we worked?
You have worked
You have not (haven't) worked
Have you worked?
They have worked
They have not (haven't) worked
Have they worked?
Example:
I have already been in museum of poet Alexander Block.
I have not been in museum of poet Alexander Block yet.
Have you already been in museum of poet Alexander Block?