9th year - Present Perfect Simple

Form:

Affir: S + have/has + past participle She has lived here for 2 years.
Neg: S + have/ has + not + past participle They haven't drunk since your last party.
Int: have/ has + S + past participle Have you seen Dad?

Use:

for actions that took place in an indefinite time in the past.
for actions that started in the past and come until the present time.

Time expressions:
for, since, just, already, ever, never, yet...

Now, try to answer to this exercise:

http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/pperf1.htm