It wasn’t always like this though.1.请解释下此处though的用法以及它的一般性,常用的用法?

它可以放句首,也可以放句末

楼上回答得很好，就是有个单词错了~
serious~~不要介意

虽然的意思.
它可以放句首,也可以放句末.用法的话,你可以和ALTHOUGH 一起来记.
although 与 though的用法区别
一、用作连词
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.
二、用作副词
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.
三、用于习语
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.
四、用于倒装
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.

though 这里用做副词，前一般有逗号。翻译成：但是。如
He caught a cold. It was nothing srious , though.