' It works with both negatives and positives. Consider this simple example. Tom: I'm going to the park.
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eipjooSo I guess the first ‘what if’ has different meaning from (2) and (3).No. They are all the same.
CalifJimNo. They are all the same.I recommend to look this dictionary: http://oxforddictionaries.com/definition/english/what?q=what+if#what__28
eipjooI justfindfound another meaning of 'what if' in Oxford Dictionary: it says it has this meaning, what does it matter if.'