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从句:

If+主语+动词一般过去时(Be动词用were)

主句:

主语+ should/would/might/could+do:

If I were you, I would take an umbrella.

如果我是你,我会带把伞。(事实:我不可能是你)

If I knew his telephone number, I would tell you.

如果我知道他的电话号码,我就会告诉你。(事实:不知道)

If there were no air or water, there would be no living things on the earth.

如果没有水和空气,地球上就不会有生物。(事实:地球上既有空气也有水)

If I had any money with me, I could lend you some.

如果我带钱了,我就会借给你些。(事实:没有带钱)

If he studied harder, he might pass the exam.

如果他再努力些,就能通过考试了。(事实:没有努力)

If I were you, I'd wear a shirt and tie.

如果我是你,我就会穿衬衫和领带。(事实:我并不是你)