Present Perfect with for or since

You and I have been friends ...

• for 2 years

• since 2 years

She has taken ballet classes...

• for a long time

• since a long time

I haven't seen my grandma

• for March 21st

• since March 21st

My teacher has worn glasses ...

• since years

• for years

My dad has had his watch ...

• since my last birthday

• for my last birthday

two years

• since

• for

... my last birthday

• for

• since

... I can remember

• since

• for

...I was very little

• for

• since

... you came to school

• for

• since