操作方法
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：She could not speak for sorrow.因为难过，她一句话也说不出。
3、thanks to. 例句：Thanks to your help,we finished the job. 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。