Actions happen because of a situation, and that is called cause and consequence, which often use the words so and because:
I was hungry so I ate a sandwich. - consequence
I ate a sandwich because I was hungry. - cause
Sometimes other words are used to express this situation:
I ate a sandwich AS A RESULT OF being hungry. - cause
They were late because they got stuck in traffic.
RESULT
They were late (1) stuck in traffic.
Marcella left home very early because she wanted to be sure of catching the train.
ORDER
Marcella left home very early (2) miss the train.
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