Simple Present Perfect or Present Perfect

Signal words	Use	Form	Examples affirmative	Examples negative	Examples interrogative
just yet never ever already so far, up to now, since for recently	you say that sth. has happened or is finished in the past and it has a connection to the present action started in the past and continues up to the present	have/has + past participle* *(infinitive + -ed) or (3rd column of table of irregular verbs)	I have worked.	I haven't worked.	Have I worked?
			He has worked.	He hasn't worked.	Has he worked?
			I have gone.	I haven't gone.	Have I gone?
			He has gone.	He hasn't gone.	Has he gone?