He went to bed, for he was tired. (For = coordinating conjunction)
He went to bed, because he was tired. (Because = subordinating conjunction)
Is this correct? If so, I'm confused.
In all the examples and explanations I've found online it says 'for' is a preposition unless used in that particular way above, in which case it becomes a coordinating conjunction (FANBOYS). But to me it seems like 'for' has the exact same function and meaning as 'because' in the above example. Both could be replaced with 'due to the fact that...'
Why is 'because' subordinating but 'for' coordinating?
FANBOYS: for, and, nor, but, or, yet, so