Present Perfect Simple

There has been snow on the ground______New Year's Day.

• since

• for

The weather has been cold______a long time.

• since

• for

Maria has studied English_____less than a year.

• since

• for

Mr. and Mrs. Roberts have been together_____they were in college.

• since

• for

They have known each others_____more than fifty years.

• since

• for

We haven't since Aziz_____last month.

• since

• for

I've had a cold_____over a week.

• since

• for

I haven't heard from my sister_____the beginning of March.

• since

• for

Last January, I (see)_____snow for the first time in my life.

Since classes began, I (have, not)_______much free time. My classes keep me really busy.