For/since
I've lived here ____ 35 years.
I've lived here for 35 years.
I've been a student here _____ January.
I've been a student here since January.
I've played the piano ____ I was eight.
I've played the piano since I was eight.
I've lived here ___ three years.
I've lived here for three years.
I've gone to this school ____ 3rd grade.
I've gone to this school since 3rd grade.
I've lived here ____ 2010.
I've lived here since 2010.
We have had class ___ 2 hours.
For
He has lived there ___ 2 years.
For
We've done online classes ____ March.
since
She has had her job ___ 2010.
Since