because of,due to,thanks to 等都可以用来表示原因，但其用法却各有不同。
1． because of意为“因为，由于”，普通用语，比其他短语更口语化；构成的短语在句子中通常作状语，一般不作表语用；后面可接名词、代词、分词或what引导的名词性从句等。
Eg. Sampras is likely to miss the US Open because of his back injury.桑普拉斯因为背部有伤可能缺席美国公开赛。（置于句后作状语）
Because of my bad leg ,I couldn’t walk so fast as the others.由于我的腿坏了，我不能像其他人走得那么快。（置于句首做状语，但用逗号与其他部分分开）
Because of his wife’s being there,I said nothing about it.因为他妻子在场，我对此事只字未提。(接-ing分词短语)
He realized that she was crying because of what he had said.他意识到她在哭是因为他说的那些话。(接what从句)
2.due to“由于，因…造成”，引导的短语在句中除可作状语（此时不用于句首）外，也可作表语或定语。有些讲英语的人仅将 due to 用于动词be之后作表语，但目前普遍认为可将due to看作是owing to的同义词。
Eg.Your failure is due to negligence.你的失败是由于疏忽所造成的。
A part of the energy is wasted in machines due to friction.
一部分能量由于摩擦而消耗在机器内。
That Shelley became a poet may have been due to his mother’s influence.雪莱成为诗人可能是由于受母亲的影响。
Accidents due to driving at high speed were very common that weekend.在那个周末因高速驾驶造成的交通事故很多。
Joe’s application to the University was not accepted due to his failing English.乔因英语不及格申报那所大学没被录取。
注意：due to除可表示原因外，还有“应给于，应属于”的意思。
Eg. Our grateful thanks are due to you.向你表示我们衷心的感谢
3.thanks to “由于或因为某人（某事）”，通常用于好的方面，译为“多亏”，但有时作反语；引导的介词短语可置于句首或句末。
Eg.The play succeeded thanks to fine acting by all the cast.由于全体演员的出色表演，那出戏才成功。
It was thanks to his carelessness that we lost the game.由于他的疏忽大意我们输掉了这场比赛。
Thanks to your help, we were successful.多亏了你的帮助，我们得以成功。
Thanks to the bad weather ,the match had been cancelled.多亏这个倒霉天气，挺好的比赛取消了。（反语）
注意：Small thanks to 一点也不感激
Eg. We were successful ,but small thanks to you.我们成功了，但一点也不感激你。
参考资料：问吧
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