1、with+名词表示因为。例句：Her eyes shone with pleasure.因为高兴使得她两眼泛光。
2、for+名词、动名词或从句，表示因为。例句：Shecouldnotspeakforsorrow.因为难过，她一句话也说不出。
3、thanksto.例句：Thankstoyourhelp,wefinishedthejob.因为有你的帮助，我们完成了这项工作。
4、by means of+人或物的自然状况。例句： By means of hard work she passed the exam.因为努力学习，她通过了考试。
5、for the reason that+从句。例句：She was refused for the reason that he was very old.因为年龄大，她被拒绝了。
6、because，这是最常见的也是直接用来回答why的提问。例句：He was scolded by his teacher because he was late.他因为迟到而受到老师的批评。
7、account for，"是……的原因"。例句：That accounts for the plane being delayed.那就是因为飞机晚点了。
