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 …

　　…… 是適當(dāng)?shù)?It is proper (for sb.) to do / that …

　　……是緊急的 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.

　　我們應(yīng)當(dāng)保持公共場(chǎng)所清潔。

　　6. 花費(fèi) spend … on sth. / doing sth. …

　　例：我們不應(yīng)該在我們不感興趣的事情上花太多的時(shí)間。

　　We shouldn't spend too much time on something we aren't interested in.

　　7. how 引導(dǎo)的感嘆句

　　例：那至少可以證明你很誠(chéng)實(shí)。

　　At least it will prove how honest you are.

　　8. 狀語(yǔ)從句

　　A) 如果你不……，你就會(huì)…… If you don't ..., you'll ...

　　例︰If you don't keep working hard, you'll lose the chance.

　　如果你不堅(jiān)持努力工作，你就會(huì)失去這次機(jī)會(huì)。

　　B) 如此 ……，以至于…… so … that …

　　例：At that moment, I was so upset that I wanted to give up.

　　當(dāng)時(shí)，我非常傷心，最后都想放棄了。

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