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So once again to express my thoughts in brief. The most common thing is a zero conditional. A sentence structure "If/when + present tense, present tense" represents a zero conditional. Then there are four more types described in the unit, what I am going to mention all over again. Basically, all students need to remember is a structure of the sentence, after that, it is clear as a day. Probably, a mixed type conditional sentence would be problematic.
