Correct the mistakes 1)actors may learn a lot of dialogues by heart. 2)your glass is empty. must i refill it ? 3)would i introduse mr.brown to you ? 4)my sister can play a few musical instruments. 5)some years ago i didnt an speak english.

1) Actors can learn a lot of dialogues by heart.
2) Your glass is empty. Shall I refill it?
3) May I introduce mr. Brown to you?
4) My sister can play several musical instruments.
5) A few years ago I couldn't speak English.