When can you use in past tense or
This is far too broad a question to answer on the Q&A forum.
You need to study some of the lessons on the passé composé and the imparfait and the exercises associated with those.
Here are a couple -
Le Passé Composé (Indicatif)
Hope they help ...
Please could you state which lesson or link to the question that you are needing help with?
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