Do they have the same meaning?

In affirmative sentence: The phone's rining. It could be Tim. (It could be Tim.= It may/might be Tim) But In negative sentence, if I say: The phone's rining. It could not / couldn't be Tim. Does "It could not / couldn't be Tim." mean "It can not / can't be Tim.", do... show more In affirmative sentence:
The phone's rining. It could be Tim. (It could be Tim.= It may/might be Tim)

But In negative sentence, if I say:

The phone's rining. It could not / couldn't be Tim.

Does "It could not / couldn't be Tim." mean "It can not / can't be Tim.", do it?

Do they have the same meaning?
2 answers 2