1,零条件句（真实条件句）：
(When)If you heat water, it boils.
Oil floats if you pour it onto water.
2,带有祈使句的条件句：
If you are cold, put on your coat.
Let me know if you need help.
3,第一条件句：
If it rains, we won’t go to the park.
We will go out to play if it snows.
If I cook, will you do the dishes?
4,第二条件句(虚拟条件句）：
If I won the lottery, I would leave the job.
If I were you, I wouldn’t do that.
5,第三条件句（对过去情况的虚拟）
If we had left ealier, we would have caught the train.
If you hadn’t looked down, you would have reached the other end.
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