15. 随着人口的增加…… With the increase/growth of the population， …
随着科技的进步…… With the advance of science and technology， …
例：With the rapid development of Taiwan's economy， a lot of social problems have come to pass.随着台湾经济的快速发展许多社会问题产生了。
16. ……是必要的 It is necessary (for sb.) to do / that …
…… 是重要的 It is important/essential (for sb.) to do / that …
…… 是适当的 It is proper (for sb.) to do / that …
……是紧急的 It is urgent (for sb.) to do / that …
例：It is proper for us to keep the public places clean. It is proper that we (should) keep the public places clean.我们应当保持公共场所清洁。
17. 花费 spend … on sth. / doing sth. …
例：我们不应该在我们不感兴趣的事情上花太多的时间。
We shouldn't spend too much time on something we aren't interested in.
18. how 引导的感叹句例：那至少可以证明你很诚实。
At least it will prove how honest you are.
19. 状语从句
1)如果你不……，你就会…… If you don't …， you'll …
例：If you don't keep working hard， you'll lose the chance.如果你不坚持努力工作，你就会失去这次机会。
2)如此 ……，以至于…… so … that …
例：At that moment， I was so upset that I wanted to give up.当时，我非常伤心，最后都想放弃了。
3)每当我听到……我就忍不住感到兴奋。
Whenever I hear …， I cannot but feel excited.每当我做……我就忍不住感到悲伤。
Whenever I do …， I cannot but feel sad.每当我想到……我就忍不住感到紧张。
Whenever I think of …， I cannot but feel nervous.每当我遭遇……我就忍不住感到害怕。
Whenever I meet with …， I cannot but feel frightened.每当我看到……我就忍不住感到惊讶。
Whenever I see …， I cannot but feel surprised.例：Whenever I think of the clean brook near my home， I cannot but feel sad. = Every time I think of the clean brook near my home， I cannot help feeling sad.每当我想到我家附近那一条清澈的小溪我就忍不住感到悲伤。
20. 宾语从句
我认为，…… / 我认为……不 I think / I don't think that …
我想知道是否…… I wonder whether …
例：He doesn't think I should stop him joining the club.他认为我不应该阻止他参加这个俱乐部。
21. Since + S + 过去式， S + 现在完成式。
例：Since he went to senior high school， he has worked very hard.自从他上高中，他就一直很用功。
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