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The imperfect expresses an action that lasts in the past, or is often repeated. It is particularly used to develop descriptions in the past.
The conditional is used to express a hypothesis, an uncertainty, or to mitigate certain forms (to be polite for example).
The subjunctive generally expresses a fact simply considered as an idea and not in reality.
Answer:
the imperfect subjunctive is used in place of the present subjunctive in subordinate clauses requiring the subjunctive and introduced by a principal in the simple past, in the imperfect, in the more-than-perfect, in the previous past, in the compound past (if it does not have a purely aspectual value
Explanation: