表示“虽然”，两者大致同义，可换用，只是although 比though 更为正式：Though [Although] it was raining，we went there. 虽然下着雨，但我们还是去了那儿。
Though [Although] it was barely four o’clock, the lights were already on. 尽管才四点钟，灯已经亮了。
Though [Although] we are poor, we are still happy. 我们虽然穷，仍然很快活。
although 一般不用作副词，而though 可用作副词，且一般放在句末(不放在句首)，意为“可是”、“不过”：
It’s hard work; I enjoy it though. 工作很辛苦，可是我乐意干。
He is looking fit, though. 但他看起来很健康。
You can count on him, though. 不过你可以指靠他。
在as though(好像，仿佛)，even though(即使，纵然)等固定短语中不能用although：
She closed her eyes as though she were tired. 她闭上眼，仿佛很疲劳似的。We felt as though we had witnessed the whole thing. 我们感到仿佛目击了整个这件事似的。
He is an honest man, I must say, even though I have opposed him. 尽管我反对过他，我还得说他是一个诚实的人。
She was always afraid of men, even though she had lots of boyfriends.尽管她有很多男朋友，她总是害怕男人。
though 引导的让步状语从句可用部分倒装的形式(注意：倒装后位于句首的名词之前不用冠词)，但although 一般不这样用：
Poor though I am, I can afford it. 我虽穷，但这东西还是买得起的。
Child though he was, he did quite well. 他虽是孩子，但干得很好。
Although he was tired, he went on working.
Although many difficulties are still ahead, we are determined to make greater achievements. 尽管在前面的道路上还有许多困难，但是，我们决心要取得更大的成就。
He often helps me with my English although he is quite busy. 尽管他相当忙，但是还常常帮我学英语。
Our car is old although it still runs well.
The war is over, although strong cunning enemy, or be eliminated.
3. although引导的从句不能与but, however连用，但可与yet, still连用。不能说：Although he was old, but he worked hard. 应把but去掉。当然，保留but 而去Although也可。
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，不能指假设的情况，而though 引导的句子可表假设。当让步状语从句指某种假设情况时，通常用though,而不用although。如：
Though all the world were against me, I should still hold to my opinion.
Though everybody deserts you, I will not.
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，不能作副词放在词尾，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.
Though/Although my car is very old, I don't want to buy a new one.
He insisted on doing it although I warned him not to.
②even能和though组合表示强调，但even不能和although组合。因此，不能说even although,在这里even though=even if(no matter if; though即使……也……) Even if/Even though we could afford it, we wouldn't go abroad for our vocation.
④though可以独立用作副词，常放在句末，意为all the same (还是；仍然)或however(可是；然而)，而although无此用法。
She didn't tell me what she had done, but I know it though.
It's hard work. I enjoy it, though.
Bravely though they fought, they had no chance of winning.
Although/Though he has a lot of money, yet/still he is unhappy.
Although tired (=Although he was tired), he kept on working.
The problem, though complicated(=though it is complicated), can be solved without much difficulty.