We couldn't understand them because they were talking in Chinese.
我们听不懂他们在讲些什么，因为他们说的`是汉语。
His school work is suffering because of family problems.
由于家庭问题，他的学业日渐退步。
Two players are out of the team because of injury.
两名队员因伤退出了比赛。
按照题目要求，举例造句如下，仅供参考：
1、 i was late this morning because i missed the bus.我今天早上迟到是因为没赶上公交车。
2、the game is cancelled because of the weather.由于天气原因比赛取消。
3、 my mother takes care of me beause she loves me.我妈妈照顾我因为她爱我。
