There is a mistake in each sentence.correct the mistakes1,actors may learn a lot of dialogues by heart2.your glass is empty.must i refill it? 3.would…

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