13. One…the other

　　你看见桌子上有两只笔吗？一支是红色的，另一支是黑色的。

　　Have you seen two pens on the desk？ One is red，the other is black.

　　14. Some…others

　　每个人都很忙，有些在读书，有些在写作。

　　Everyone is busy in classroom. Some are reading，others are writing.

　　15. make…+adj /n

　　我们所做的可以让世界更美丽。

　　What we do will make the world more beautiful.

　　16. not…until

　　直到他告诉我发生的事，我才了解真相。

　　I didn’t know the truth until she told me what happened.

　　17. as if

　　他夸夸其谈好像什么事都知道。

　　He talks a lot as if he knows everything.

　　18. It is no use （good） doing…

　　假装不懂规则是行不通的。

　　It’s no use pretending that you didn’t know the rules.

　　19. find it + adj to do…

　　我觉得作听力时有必要作笔记。

　　I find it necessary to take down notes while listening.

　　20. It is + time since…

　　我已经有两年没见他了。

　　It is two years since I last met him.

　　21. It is + time when…

　　我到电影院时已经八点钟了。

　　It was 8 o’clock when I got to the cinema.

　　22. It is + time before…

　　不久我们就会再见面的。

　　I won’t be long before we can meet again.

　　23. It is…that…

　　我最珍视的是友谊。

　　It is friendship that I value most.

　　24. It is + n / adj + that / to do…

　　每个人都必须懂得如何使用计算机

　　It is a must that everybody should know how to use computers.