Look at the explanations on the left and choose whether you should use "SINCE" ou "FOR" in the following sentences.
"SINCE" vs "FOR"
SINCE points to the BEGINNING of a period of time. SINCE is followed by a specific past time. It usually requires a perfect verb in the main clause:
FOR indicates the LENGTH of a period of time (with no reference to WHERE in time that period is located). FOR is followed by a number or amount of time. The rest of the sentence tells the time, which can be past, present, future, or anything.