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although, though - Although and though are interchangeable as conjunctions, but to start a clause, use although.
You use although or though to introduce a subordinate clause in which you mention something that contrasts with what you are saying in the main clause. Though is not used in very formal English.
You can put even in front of though for emphasis.
Don't put 'even' in front of although.
When a sentence begins with although or though, don't use 'but' or 'yet' to introduce the main clause. Don't say, for example, 'Although he was late, yet he stopped to buy a sandwich'. You say 'Although he was late, he stopped to buy a sandwich'.
Don't use although or though in front of a noun phrase. Don't say, for example, 'Although his hard work, he failed his exam'. You say 'In spite of his hard work, he failed his exam' or 'Despite his hard work, he failed his exam'.
Though is sometimes an adverb. You use it when you are making a statement that contrasts with what you have just said. You usually put though after the first phrase in the sentence.
In conversation, you can also put though at the end of a sentence.
Although is never an adverb.