How many conditional sentences are there? What are their usage?
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Some course books and student grammars list five types, first, second, third, mixed and zero. This is in fact an over-simplification. there are other types.
I prefer to think of four broad categories, factual, predictive, hypothetical and counterfactual - see the series of articles beginning here: http://www.usingenglish.com/articles...english-1.html