一、与现在事实相反：从句时态中一般过去时态。主句中would/should/could 加动词原形。注意账号例句中if 跟前的是从句
1．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）
2．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）
3．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)
4．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）
5．she looked at me as if I were a stranger.
她看我的样子好像我是一个陌生人.（事实：我并非陌生人）
这些情态动词，would 用的居多
懂了吗
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