19 Underline the correct word. 1 Good morning. How can / must I help you? 2 Frank may / must be late this evening. 3 I'm sorry. You can't / couldn't park here. 4 Could / Must I sit here, please? 5 May / Must I borrow your pen, please? 6 I must / can't go to the hospital. I feel ill.

Решение:

1. Good morning. How can I help you? (Вопрос вежливой просьбы или предложения помощи.)
2. Frank may be late this evening. (Выражение предположения, неуверенности.)
3. I'm sorry. You can't park here. (Выражение запрета.)
4. Could I sit here, please? (Вежливая просьба.)
5. May I borrow your pen, please? (Вежливая просьба.)
6. I can't go to the hospital. I feel ill. (Выражение невозможности, отсутствия возможности.)

Ответ: can; may; can't; Could; May; can't.