PRESENT PERFECT: FOR OR SINCE

I haven't seen Tom _____ last week.

• since

• for

Luis has been sick ____ two weeks now.

• since

• for

They have been married _____ 25 years!

• for

• since

I have worked here ____ 2011.

• for

• since

I have studied ____ three days. I think I'm prepared for the exam.

• for

• since

This place looks terrible! You haven't cleaned ____ more than a week!

• for

• since

Is that Fernanda? I haven't seen her ____ we were in junior highschool.

• since

• for

I haven't slept _____ hours.

• for

• since

We haven't met with our friends ____ the pandemic started.

• for

• since

Luis has lived in Cuautitlan ___ he was five years old.

• since

• for