例：with the rapid development of taiwan's economy, a lot of social problems have come to pass. 隨著台灣經濟的快速發展許多社會問題產生了。
5. ……是必要的 it is necessary （for sb.） to do / that … ……
是重要的 it is important（for sb.） to do / that … ……
是適當的 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. 我們應當保持公共場所清潔。
6. 花費 spend … on sth. / doing sth. …
例：我們不應該在我們不感興趣的事情上花太多的時間。 we shouldn't spend too much time on something we aren't interested in.
7. how 引導的感嘆句
例：那至少可以證明你很誠實。at least it will prove how honest you are. 8. 狀語從句
a）如果你不……，你就會…… if you don't …， you'll …
例：if you don't keep working hard, you'll lose the chance. 如果你不堅持努力工作，你就會失去這次機會。
b） 如此 ……，以至於…… so … that …
例：at that moment, i was so upset that i wanted to give up. 當時，我非常傷心，最後都想放棄了。
9. 賓語從句：我認為，…… / 我認為……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.他認為我不應該阻止他參加這個俱樂部。
10. since + 主語+ 過去式， 主語 + 現在完成式。
例：since he went to senior high school, he has worked very hard.自從他上高中，他就一直很用功。