when we use passe compose and imparfait we intend a given time in past. But what is the distinction between them exactly?in other word, what is difference between passe compose and imparfait?
Le passé composé is the past tense - it describes a brief action in the past.
But l'imparfait refers to past continuous - it actually describes a long action in the past, for example:
"Je prenais une douche, soudain le téléphone a sonné"
"I was taking a shower; suddenly the phone rang"