Hi there,

I�m working on sentence transformation and I am not sure about the following sentence.

"My uncle would be able to help us if he didn�t work extra hours".


UNLESS___________________________________________________________________________.

This is my attempt:

Unless my uncle didn�t work extra hours, he would be able to help us.


It sounds awkward to me and I know that "unless" is negative and it can�t be followed by a negative verb.


But, what is the best answer then?

I wonder if you can help me. Thanks in advance!