No, you cannot say, 'J'étudiais le français pendant deux ans.' as it lasted two years in now finished, the only possibility is-
'J'ai étudié le français pendant deux ans.'
Pendant, in this context, refers to a well defined period in the past. Therefore I would say:
J'ai étudié le français pendant deux ans.
I don't think there is a rule forbidding the use of imparfait in conjunction with pendant. It's just that in this example, I would use the passé composé.
The opinion of a native speaker would be greatly appreciated, though.
Can we use l'imparfait with pendant?
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