Answer:
Rewrite the following sentences in the past tense.
1. They went into the forest.
2. I heard someone sing.
3. We succeeded in killing the giant.
4. We light the message.
5. They lived happily ever after.
6. You had a weird dream.
Explanation:
You would use vous, since M. Bernard means Mr. Bernard, and is formal. Generally if you're addressing someone as "Mme." "M." or "Mlle.", it's formal.
