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I don't know if she loves me.

Vs

I don't know if she loves me or not.

Could we use only if in the above sentences, without the use of "or not"?

What's the difference in their meaning?

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up vote 0 down vote

Actually, there is no difference between them, but, we usually use "if" without "not".

I don't know if she loves me.

I don't know whether she loves me or not.

This is just a difference of usage.

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