what is the difference between ALTHOUGH and THOUGH?

THOUGH [ðəu; ðə] adv。可是,然而,不过 conj。尽管,虽然 prep。但。ALTHOUGH [ɔ:l'ðəu] conj。尽管,虽然 词性上和意思上略有区别。如果你非要知道的很详细的话：1。两词同义并可换用,但although语气较重,通常放在句首并用于正式场合。如：I'd quite like to go out,(al)though it is a bit late。我很想外出,虽然为时稍晚。Although it was snowing,it was not very cold。虽然下着雪,但并不很冷。2。用though 时,可将强调的词前置,但although 不能。as也有此种倒装结构。如：Poor though / as he is ,he is happy。虽然他穷,但过得很愉快。Child though / as she was,the actress was drawing a crowd。尽管还是个孩子,这个女演员却引起了人们的注目。（child前无冠词a）3。although 引导从句常指事实,而though 引导的句子可表假设。如：Let's start as arranged though it rains tomorrow。即使明天下雨,咱们也按预定的计划出发吧。（假设）He was not unhappy although he had to live alone。虽然得一个人生活,他毫无不快之感。（事实）4。although 只用作连词,而though 除作连词外,还可用作副词,常置句末,句子较长时,也置于句中。如：It's hard work,I enjoy it though。这是苦差事,可我干得颇有乐趣。There's no excuse,though ,for hurting her feelings。伤到她的感情一事,还是不可原谅。5。though 可用于even though,as though 等结构,although则不能。如：Even though I fail,I'll keep on trying。我纵然失败,仍会继续尝试下去。You look as though (=as if ) you know each other。看起来你们好像彼此认识。6。although 和 though 用作连词时不能和but连用,但可跟yet,still 等连用。如：Although he lives alone,yet he is happy。= He lives alone,but he is happy。他虽然单独生活,但很愉快。7。though 常用于省略句。如：Though (he is) alone,he is happy。