Explanation

AGO

German learners of English also make the mistake of translating the German word Vor with the English word for and before. So they make sentences like:

WRONG

I bought this car for three years Ich kaufte das Auto vor drei Jahren

She was here for three days. Sie war hier vor drei Tage

He was in Paris before two years. Er war in Paris vor zwei Jahren

RIGHT

I bought this car three years ago.

She was here three years ago.

He was in Paris two years ago.

Ago normally comes at the end of the sentence and unlike since and for (which go with the present perfect tense) it normally goes with the simple past tense and indicates that something happened at a particular time in the past.