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?