Pois explicativo (porque formal)

The other pois

You just met pois and pois é as agreement tags. Written and careful Portuguese uses pois a second way: as a connective meaning because / for, always after a comma:

I am tired, for I went to bed late.
Estou cansado, pois deitei-me tarde.
everydaymore formal
Fico em casa porque chove.Fico em casa, pois chove.

The explicative pois never starts the sentence — it introduces the justification for what was just said, exactly where English might put "for".

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