It's easy to confuse although and however because they're both used to show a contrast between ideas. But they aren't the same kind of words. Although is used to start a dependent clause. However, is used to link two independent clauses that have a full stop between them.
1. Linking words. But, although and however
2. OBut, although and however all express contrast OAlthough and however are more formal than but, and are used more in formal writing.
3. But O It joins two clauses. It must go before the second clause. O I don’t write many letters, but I send emails a lot. O I like dogs, but I don’t like cats.
4. Although OIt joins two clauses. It can go at the start of the sentence in which case a comma separates the clauses. OIt can also go in the middle of a sentence in which case it is preceded by a comma.
5. O Examples: O Although I don’t write many letters, I send emails a lot. O I send emails a lot, although I don’t write many letters,
6. However OIt joins two sentences, and introduces the second the second sentence . OIt is preceded by a full stop and fallowed by a comma. I don’t write many letters. However, I send emails a lot.
7. So and Because OSo introduces a result or consequence. He was sick, so he left the office. OBecause introduces a reason. He left the office because he was sick.
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