bb wrote:
I agree with you. I think it should have been the possibility because later it says it’s.
However, technically, Recipients have possibilities. They each have a possibility. They don’t just have one possibility among all of them. There are many possibilities.
However the sentence probably should have also said “their bodies” because again, patients don’t just share one body.
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Should the sentence read as below as per your suggestions?
a serious problem faced by transplant recipients has been the possibility that their own bodies will try to reject or destroy the transplant
or
a serious problem faced by transplant recipients has been the possibilities that their own bodies will try to reject or destroy the transplant
I feel that the word "possibility" or "possibilities" should look upto "a serious problem" which is singular. As per the subject verb agreement, the first one should be correct. Please suggest.