When to use the past simple or present perfect

1. Past Simple Present Perfect
Form: Affermative
Regular verbs. Subj. + verb + "ed"
I __________my grandparents on the
weekend.
Subj. + have/has + past participle
We ______ visited many places.
Irregular verbs. Subj. + irregular verb
We _____together for lunch.
We have _______ together many times
for lunch.
Negative
Subj. + didn't + base verb.
He didn't ________his coffee.
Subj. + haven't/hasn't + past participle
He hasn't _________ TV today.
Interrogative
Question word +aux+subj.+ base verb
What did you ______ to on
the radio?
Question word + aux + subj. + p.p.
Have you ______ your
homework yet?
Use:
to speak about "finished" or "definite"
time
to speak about "unfinished" or "indefinite"
time.
yesterday today
last week, month, year this week......
on Monday/at 4:00 o'clock/ in June Since + beginning of the period of time
since Monday/4:00 o'clock/June
I have ____ this watch _____2013.
3 minutes, hours, days months years ago For + period of time that starts in the
past and continues to the present.
for 3 minutes,hours, days, months, years
I have _____ this watch ____ 2 years.
for + period of time that starts and
finishes in the past
He had this watch for three years but
then he lost it.
just
I ____ just finished the book.
yet (questions/negatives);already (pos.)
Have you seen that film______?
She hasn't bought the ticket _____.
We have__________been to London.
Been=go and return gone= go but haven't
returned yet.
She has ____ to Rome many times.

2. Where is Sara?She isn't here. She's ____
to Mary's house.
N.B. Use "still" with present simple.
Iliked cartoons when I was a child. I still like cartoons.