meaning - "Should" cannot replace "if?"




Possible Duplicates:
Are “should” and “if” interchangeable at the beginning of a sentence?
A special use of “should”?



For sentences that begin with "If", it seems that "should" can replace "If." For example:



If you ever...


Should you ever...



However after googling, it seems that "should" should not be used to replace "if." If this is true, then why do people do it?


I also looked up "should" in the dictionary, and I didn't find anything that says it means the same thing as "if."




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