Помогите!!!! Подчеркните модальные глаголы или их эквиваленты. Предложения переведите:
1. I cannot understand how he managed to persuade his friend.
2. He will never be able to hear the serenade without a strange mixture of laughter and pain.
3. We think you must improve the situation.
4. She had to suffer a lot during the war.
5. You are to make a great effort of will to give up smoking.