I came across the following exercise in some grammar book:
I don't watch TV unless/as long as I have nothing else to do.
Interestingly, the answer key is "unless".
The sentence with "as long as" is grammatical, but seems a little meaningless to me.
As concerns the one with "unless", I wonder it is grammatical.
1) Is the "unless + negative" construction in one clause grammatically correct?
2) Which is the right option?
Thanks!
Unless
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Re: Unless
Yes, 'unless' (which means simply 'except in the case that') is correct here.