С. языком 7. 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 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 a few musical instruments. 
5. Some years ago I didn’t speak English.