They should be at school by eight o'clock.句中为什么用by?

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They should be at school by eight o'clock.句中为什么用by?
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They should be at school by eight o'clock.句中为什么用by?
They should be at school by eight o'clock.
句中为什么用by?

They should be at school by eight o'clock.句中为什么用by?
they should be at school - 他们必须已经来到学校,已经在校园里
by eight o'clock - 在八点钟或之前
by - 最迟 的意思

他们必须在八点到校。

他们八点钟之前应该在学校.by是表示在......之前

他们应该在八点钟之前来学校上课.

他们8点应该在学校

They should do it at once.It should be done at once. 求雅思大作文批改 请帮忙看一下有多少分并提点意见Some people believe that children should be allowed to stay at home and play until they are six or seven years old.Ohters believe that it is important for your children to go to sc They should study hard and be good at their subjects.怎么翻译 Teenagers should not be allowed to drive because they aren't s_______ enough at that age They should be at school by eight o'clock.句中为什么用by? 英语翻译This means should anti-dumping tariffs be imposed at the end of the year,they could be retroactively applied. 英语翻译They say that Bruno should be executed if his actions were not forced by the Emperor.He should be burned at the stake.' young students should not be allowed to work at night,because they( )to sleep Amust Bshould Cneed They should be free翻译成中文 Parents should not be too_______ with their children.Yes.They should make their children feelrelaxed at home A angry B friendly C strict D pleased 13.they started off at about 5 o'clock in the morning.they should there by now .a:arrive b:havebeen arriving c:have arrived d:be arriving They insisted that the sick child_______to the hospital at once!A.must be sent B.be sent还有虚拟语气是不是就是以should开头. Why be all together I fell in love with you,at least your off should not be too depressed.Why should be all together to escape a life before they make this night seem so empty.中文 求以Good children must be good students at school.They should work hard at all...开头的文章Good children must be good students at school.They should work hard at all subjects and do what is given to them on time.拜谢不是翻译哦,是求 They (not be) at school just now. they should do the work at once改被动语态 they should do it.at once改为被动语态 T_______ should not smoke (吸烟) when they study at home.