MARCADORES

I have been studying mathematics________ three hours

• since

• for

George has worked in this company _______ 8 years

• since

• for

The socialist party has been in power ________ March 2004

• since

• for

This terrorist has been in prison _________ three years

• since

• for

My mother has been travelling _______ last April

• since

• for

The oil price has been going up ________ three months

• since

• for

Alice has been in her bedroom ______ two hours

• since

• for

George has worked in this company _____ 1997

• since

• for

We have been married _______ 12 years

• since

• for

My French teacher has been ill _______ last week

• since

• for