The present perfect with for, since

1. THE PRESENT
PERFECT WITH FOR,
SINCE ...

2. •PRESENT PERFECT + for, since
-When talking about the length of time (duration), we use the
present perfect with for + a period of time.
-When talking about a starting point, we use the present perfect
with since + a point in time.
•For + a period of time:
forsix years, fora week, fora month,forhours, fortwo hours.
I have worked here for five years. She has lived here for twenty years.
They have been married for six months.
•Since + a point in time:
-sincethis morning, sincelast week, sinceyesterday, sinceI
was 12, sinceFriday, since6 o'clock.
I have lived here since 1998. They have been married since June. We have
been at this school since last year.

3. •PRESENT PERFECT + adverbs (ever, never, already, yet, still)
'Ever'and 'never'are always placed before the past participle.
'Ever' = sometime before now, is used:
a.in questions
Have you everbeen to Canada?
Has she evermet someone famous?
b.in negative questions
Haven't they everbeen to Canada?
Haven't you evereaten Thai food?
c.and in negative statements using the pattern nothing.......ever,
nobody.......ever e.g.
Nobodyhas eversaid that to me before.
Nothing like that has everhappened to me.
d.'Ever' is also used with 'The first time.... e.g.
It's the first time I've evereaten Thai food.
This is the first time I've ever been to Canada.

4. •'Never'= not ever. Never is used after have/has.
I have nevervisited London. I’ve neverbeen so sick.
•Already, yetand still.It can be placed before the main
verb(past participle) or at the end of the sentence.
Already= sooner than expected, is used:
a. I've alreadyheard the story five times.
b. Most people have alreadygone.
It is also used in questions:
a. Have you alreadyrang Mike?
b. Has he arrivedalready?

5. •Yetis used in negative statements and questions when we
are expecting something to happen and goes at the end of
the sentence.
a. Have you bought a ticket yet?
b. I haven't met her yet.
c. Has your course started yet?
d. They haven't arrived yet.
•Still= continuing longer than expected. Still is stronger
than yet and often expresses surprise that a situation has
continued for so long.
a. She isn’t home yet. She’s stillat work.
b. I stillhaven’t found what I’m looking for.
c. I’m stillthinking about it.