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　　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：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.

　　7. 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.

　　8. 状语从句

　　A) 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。

　　B) 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。