The first is grammatical but the second needs "anything" instead of "nothing". I don't see the first sentence as a double negative because the nothing goes with the 've got part, which is positive.
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TasmanTiger'Unless" means "if not' , so another one is possible : I don't watch TV unless I've got nothing else to do. = ~ if I haven't got nothing else to do. What do you think about this?
TasmanTiger 1. I don't watch TV unless I've got nothing else to do.Correct.
TasmanTiger 2. I can hardly believe nothing.Not correct. With hardly, you'll need anything at the end.
TasmanTiger'Nothing' cannot be used with another negative expression, I think.Rig
TasmanTiger'Unless" means "if not' , so another one is possible :It doesn't matter what you substitute, unless is not a negative word for the purposes of counting the number of negatives in a clause.
I don't watch TV unless I've got nothing else to do.
= ~ if I haven't got nothing else to do.
TasmanTigeris this sentence OK ?It's fine.
I don't watch TV unless I don't have anything else to do.