Since-For-Ago
I. Since-For-Ago
A. Ago (Il y’a)
Ago is used to express a finished action in the past and it is used with $\textbf{the simple past tense.}$
$\textbf{NB:}$ Ago $\textbf{always}$ comes at the $\textbf{end of the sentence.}$
Eg:
- I saw him three years ago.
- He ate cookies two days ago.
B. For(depuis)
$\textbf{For}$ expresses the duration , the length of an action. Contrarily to ago, it is used with the present perfect, the past perfect, the present perfect continuous and the past perfect continous.
Ex :
- He has listened to reggae music for two hours.
- I have been teaching English for ten years .
- We have done this exercise for two hours.
C. Since(depuis)
$\textbf{Since}$ expresses the beginning of an action. It is usually precised and it is used with the present perfect or the present perfect continuous.
Ex :
- I have lived here $\textbf{since}$ October 2014
- She has been washing dishes $\textbf{since}$ her chilhood.
Some expressions are sometimes used with $\textbf{since:}$
$\textbf{since}$ their wedding, $\textbf{since}$ the biginning of the year, $\textbf{since}$ his/her childhood etc.