There is a mistake in each sentence. 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 introduce mr. brown to you? 4.my sister can to play a few musical instruments. 5.some years ago i didn't can speak english.

1. Actors (may) MUST learn a lot of dialogues by heart.

2. Your glass is empty. (Must) CAN или MAY I refill it?

3. (Would) MAY I introduce Mr. Brown to you?

4. My sister (can to play) CAN PLAY a few musical instruments.

5. Some years ago I (didn't can speak) DIDN'T SPEAK или COULDN'T SPEAK English.