although和though的用法有什么区别？

although和though的用法有什么区别？
I.although conj.“尽管、虽然”引导让步状语从句，相当于though.只是比though稍微正式些。多用于句首。though用于非正式文体中，较普遍，但以下几种用法，不能用although.如：
①表强调时，要用even though,如：
Even though I didn't understand a word,I kept smiling.尽管我一字不识，我还是一直微笑着。
②Though可用在倒装句中，如：
Young though he is,.he is quite experienced.他虽然年轻，但很有经验。
③though可作副词，表示“然而”放在句末或其它位置。如：He said he would come,he didn't though.他说他要来，结果他却没来。
[此外]，although不用着副词。在英语中如果用了although或though,就不能再有but,但可以用yet或still;反之，如果用了but,就不能用although和though.如：
① Although he is in poor health,(yet)he works hard.He is in poor health,but
he works hard. 虽然他身体不好，但他工作仍努力。
②Although it was so cold,.he went out without an overcoat..虽然天气很冷，他未穿外衣就出去了。
3 He is quite strong,although very old. 他虽然很老了，但还是十分健壮。
Ⅱ.though常用作连词，“虽然”。在口语中还用着副词，一般放在句末，意为“可是、然而”等。如：
① He didn't light the fire,though it was cold. 天气虽很冷，他却还没生火。
② Though it was very late,he went on working.虽然很晚了，他还是继续工作。
③ He said he would come,he didn't,though. 他说他来，可是结果他没有来。