It depends on the instrument and whether you mean to say "playing a guitar" for example, or just "a guitar".
Well the past compound is similar with the past continuous
in English : it's be + ing
in French either avoir (have) or être (be) + past participle
the simple past is quite similar to the imparfait
you just have ti use the verb.
so the're alike by having two verbs in the continuous tense but different because in French you use either be or have. No always be.
I hope this is the answer you were waiting for .....
You would use vous since that is more formal and you use formal pronouns when talking about someone older than you
How is the English teacher? She is?