present perfect tense

The are several ways when we want to use the present perfect tense

1.It is to expres an action that happened at an indefinate time on thw past.
-Ramli has traveled around the world.(we dont know.wen)
-I.have al ready enten lunch
-have you done tuw job

2.It is expres an action that happened more than once in the past.
-sirajan has seen those movies three time each.
-they have visited the square twice.
-we have had drink in that cafe many times.

3.The present perfect tenae is to express an actiom in the past and still occuring in the present.
-Anna and I have been in the class since ten o'clock this morning.
-Ghazi has lived in the same house for twenty years(he still lives there.)
-Ghazi has liven in the same house since 1975.