例句：

　　They are here because of us.

　　他們是因為我們來(lái)這里的。

　　We couldn't understand them because they were talking in Chinese.

　　我們聽(tīng)不懂他們在講些什么，因為他們說(shuō)的是漢語(yǔ)。

　　His school work is suffering because of family problems.

　　由于家庭問(wèn)題，他的學(xué)業(yè)日漸退步。

　　Two players are out of the team because of injury.

　　兩名隊員因傷退出了比賽。

　　Why get upset just because you got one bad grade?

　　何必因為一次成績(jì)不好就想不開(kāi)呢？