although tired work(奏效；起作用) go on doing sth. 一般过去时 让步状语从句

although different personality same though totally 一般现在时 让步状语从句 语法一致

although appreciate character sing(sang sung) 介词与其它词类的搭配 一般现在时的被动语态 主语从句的连接词 让步状语从句

although before several go abroad 动名词作宾语 介词与其它词类的搭配 一般过去时 固定句型 让步状语从句

although communicate situation it 作形式宾语 让步状语从句

although remember spend(spent spent) 过去分词作定语 让步状语从句

although bad(worse worst) cause our be aware of daily life 过去分词作定语 形容词作表语 介词与其它词类的搭配 一般现在时 让步状语从句 情态动词(not)+动词原形

although necessary punishment severe 状语从句中的省略

although beginning Chinese twentieth in the world 介词与其它词类的搭配 一般现在时 让步状语从句 语法一致 date back to …