Is a comma needed before 'because' here? I'm told yes, but I don't think it is needed. I'm also told that because of the comma, or lack thereof, these sentences have two very distinct meanings.
He is not overweight, because he exercises. v I'm told that this sentence means that he is NOT overweight. The reason is that he exercises.
He is not overweight because he exercises. v I'm told that this sentence means he IS overweight, and is overweight despite the fact that he exercises. He is overweight for some other reason not mentioned in that sentence.
Do I really need the comma to make this distinction?
Top answer
I suppose there may be a distinction. She's not dating him because he's rich. She's not dating him, because he's rich.
— CalifJim
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