例：In my opinion， playing video games not only takes much time but is also harmful to health.
在我看来，玩电脑游戏既花费时间也有害健康。
4. 随着
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。
5. 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。
6. 花费 spend on sth. / doing sth.
例：We shouldn t spend too much time on something we aren t interested in.
我们不应该在我们不感兴趣的事情上花太多的时间。
7. how 引导的感叹句
例：At least it will prove how honest you are.
那至少可以证明你很诚实。
8. 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
