Since a couple of years, does itake sense anywhere?
I made this mistake
Since a couple of years we have been living together / we decided to live together

I wonder if it could be correct some way or it is said
For a couple of years

Thank you

Question

Since a couple of years, does itake sense anywhere?
I made this mistake 
Since a couple of years we have been living together / we decided to live together

I wonder if it could be correct some way or it is said
For a couple of years

Thank you

Answer

You should say:

"We have been living together for a couple of years."

:-)