though [ðəu]
conj.虽然, 尽管
adv.然而, 可是, 不过
例句:
He said he would come, he didn't, though.
他说他要来，可是并没有来。
I don't know him well though I've known him for a long time.
我对他并不了解，虽然我认识他已经很长时间了。
讲解:
【词源解说】
1200年左右进入英语，直接源自古英语的eah，意为可是，然而。
【语法用法】
区别although和though:though可以做副词，指“但是”，但是although不行。
He said he would come, he didn't, though.
句中的though不能替换成although。
as though属固定搭配，这里though不能替换成although。although要比though来得更正式，相对而言，语气比较重，但是though的使用更普遍。although引导的从句，常指实际发生的事情，而不是假象，设想。
He would not be unhappy though he should have to live alone.
就算要一个人住，他可能也不会不开心。
He was not unhappy although he had to live alone.
虽然他不得不要一个人住，却没有不开心。
though和although都可在从句中用作连词，通常表示相同的意思，但though更普遍适应于非正式的表述中
