Ответ:
- a) He must to arrive early. / b) He has to arrive early.
- Correction: He must arrive early.
- a) We must check the schedule. / b) We has to check the schedule.
- Correction: We have to check the schedule.
- a) She have to be more polite. / b) She has to be more polite.
- Correction: She has to be more polite.
Ответ: See above
Молодец! Продолжай в том же духе, и скоро грамматика английского языка станет для тебя легкой и интересной!