1. If it rains tomorrow, we'll stay home.
2. If I were you, I would surely work harder and be better.
句1为真实条件句，所述条件是有可能发生，“如果明天下雨，我们就待在家里。”
句2为非真实条件句，所述条件一般是不可能发生“如果我是你，我就会更加努力、做得更好。”真实条件句可以参考语法知识“条件状语从句”部分；而非真实条件句可以参考“虚拟语气在条件句中的用法”。
谢谢象牙大姐的指正！
2. If I were you, I will surely work harder and be better.
刚刚那位说的不是很对啊!绝对不可能是will应该用 would
正确的应该是:
前面从句是 IF were/did /sholuld do 则主句用 would do
前面从句是 IF had done 则主句用would have done
有时候需要省率IF,则要把sholud had were提前
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