The Present Perfect formation and use

I haven’t worked
He has worked Has he worked? He hasn’t worked
She has worked Has she worked? She hasn’t worked
It has worked Has it worked? It hasn’t worked
We have worked Have we worked? We haven’t worked
You have worked Have you worked? You haven’t worked
They have worked Have they worked? They haven’t worked
Contracted forms. I’ve worked He’s worked You’ve worked. I haven’t worked. Has he not worked?

action connected with the present.
I am a little frightened for I have lost my way.
The Present Perfect is frequently used with the adverbs just, yet, already and of late.
2) The Present Perfect is used in adverbial clauses of time after the conjunctions when, till, until, before, after, as soon as to denote an action completed before a definite moment in the future.
I am not going till you have answered me.

past, has been going on up to the present and is still going on. In this case for and since are used.
Mr. Cowperwood, I have known you known for something like fourteen years.
This use of the Present Perfect is called the Present Perfect Inclusive.
The Present Perfect Inclusive is used:
With verbs not admitting in the Continuous form.
“There’s nothing to be done. She is dead-has been dead for hours” said the doctor.