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.
<span>I would like to know what happened yesterday <span>at the party?
(Я хотел бы знать, что произошло вчера на вечеринке?)
</span></span><span>I would like to know what you ate this morning?</span>
(Я хотел бы знать, что ты съела сегодня утром?)
<span>I would like to know, what are you doing <span>tomorrow night?
(Я хотел бы знать, что ты делаешь завтра вечером?)</span></span>
<span>I would like to know what are you drawing?</span>
(Я хотел бы знать, что ты рисуешь?)
<span>I would like to know what she sings<span>?
(Я хотел бы знать, что она поет?)
</span></span>