We sometimes use as a conjunction meaning ‘because’. We use it in very formal, and often literary, contexts:
E. g. ‘We love God, for he first loved us.
Used to connect words of the same part of speech, clauses, or sentences, that are to be taken jointly.
E. g. Bread and butter.
Used before the second or further of two or more alternatives (the first being introduced by a negative such as ‘neither’ or ‘not’) to indicate that they are each untrue or each does not happen.
E. g. They were neither cheap nor convenient.
Used to introduce a phrase or clause contrasting with what has already been mentioned.
E. g. He stumbled but didn't fall.
Used to link alternatives.
E. g. A cup of tea or coffee.
But at the same time; but nevertheless.
E. g. The path was dark, yet I slowly found my way.
And for this reason; therefore.
E. g. It was still painful so I went to see a specialist
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