'should' may substitute for 'if' in the present tense conditional pattern. If they come early, they can wait in this room. = Should they come early, they can wait in this room.
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youzouSo I assume it is not very common in speaking. Is it?I think it is a bit commoner in BrE.
youzou I have never heard "commoner" instead of "more common".Can I use "instead of" like what I used above?