Вставьте необходимые модальные глаголы.

1. He ... to help them, they ... his help.
2. You ... work hard to do well in your English.
3. According the timetable our lesson ... to start at 12 o'clock.
4. We ... park here yesterday.

1 he has to help them,they need his help

Можно и так:he ought to help............

2 you must work hard yo do well in your English.

3 affording to the timetable our lesson is to begin at 12 o'clock

4 we could(couldn't) park here yesterday.