Type 0, If I don't sleep enough, I feel tired., If you heat water to 100 degrees, it boils., Type 1, If it rains tomorrow, we will stay at home., If you study hard, you will pass the exam., Type 2, If I had a million dollars, I would travel the world., If I were you, I would accept the offer., Type 3, If I had known about the traffic, I would have left earlier., If she had studied harder, she would have passed the test.

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