Where the second clause has past verb, that of the first can be past or present. 2a, 2b is correct. It is my brother who will win the world championship, IMO.
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InchoateknowledgeIt will be my brother who will win the world championship expresses predictionWhat do you mean? Doesn't "it is my brother.." also express prediction as it also refers to a future happening? And the cleft part of the sentence only states your oppinion on who will make an action i
InchoateknowledgeI am just trying to help you.
It will be my brother who will win the world championship expresses prediction (this is what I expect)
It is my brother who will win the world championship expresses certainty ( no doubt about it)