（1）though 可以用作副詞，作“但是”解。但 although 不可，如 He said he would come, he didn't, though 里的 though 不可改作 although。
（2）as though 中的 though 不可改作 although。參見(jiàn) as 18
（3）although 比 though 正式而語(yǔ)氣重，不及 though 通俗。
（4）although 所引導(dǎo)的從句，通常指事實(shí)而不指設(shè)想，如下面第一句里用 though，第二句里用 although：
He would not be unhappy though he should have to live alone. （他即使不得不獨(dú)自居住也不會(huì)不快樂(lè)。）
He was not unhappy although he had to live alone. （他雖然不得不獨(dú)自居住，卻并不不快樂(lè)。）
下面兩句里的 though 不可改作 although：
Let's not defer the trip though it rain (不用 rains) tomorrow.
Though everybody desert (不用 deserts) you, I will not.
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