Поставьте следующие предложения с модальными глаголоми или их эквивалентами в вопросительную и отрицательную формы. 1. I am able to play chess really well. 2. He may smoke here. 3. Our boss must sign the contract. 4. My friend could play the guitar. 5. You have to speak English at the lesson.
Am I not able to play chess really well?May he not smoke here?Must our boss not sign the contract?Could my friend not play the guitar?Do you not have to speak English at the lesson?