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although=through?并且两者不能与but连用?

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although=through?并且两者不能与but连用?
none大于3,neithger呢?
although 与though意思和用法很接近,但仍有区别:
although引导让步状语从句只能位于句首,though引导引导让步状语从句放在句首,句中都可以.
e.g.Although/Though he was tired,he still helped his wife with housework.
Tired though he was,he still helped his wife with housework.
由于although 与though都是从句的引导词,所以它们引导的让步状语从句必须要依附于一个主句,不能独立存在;
but是我们最熟悉的一个并列连词了,并列连词的意义就在于连接2个具有同等性质和语法地位的词或句子.although,though 引导的都是从句,but总不能为了履行它自己的语法功能而引导另一个状语从句与although/though从句并存吧:)
none,neither都表示否定,区别在于:none所指的对象必须是3者或3者以上;neither所指的对象必须是两者.