e pay much attention to the earth, we'll have a better world.Р 如果我们多关爱地球，就会拥有一个更美好的世界Р If it rains tomorrow, what shall we do?Р 如果明天下雨，我们怎么办？Р 注意：if还可以引导虚拟条件句，表示不可实现的条件，从句中多用一般过去时或过去完成时。РWhat would happen if there were no water ?Р如果没有水会怎样？Р2.unless引导的条件状语从句Рunless的意思是如果不，除非。可与if...not互换。РYou will fail in English unless you work hard.Р你英语考试会不及格的，除非你更加努力。Р3.as /so long as引导的条件状语从句Р as /so long as意思是“只要”РSo long as you're happy,i will be happy.Р只要你高兴，我就高兴。РⅢ条件状语从句的种类РⅣ条件状语从句的时态原则Р条件句Р从句Р主句Р真实Р一般现在时Р一般将来时Р情态动词+动原Р祈使句Р非真实Р一般过去时Рbe动词用（were）Рwould/could+动原РРРРР注意 ：Р学习" if " 引导的条件状语从句的用法,现在总结一下:Р if 条件句不一般,几个要点记心间;Р 条件句,放在前, 逗号要放句中间。Р 条件句表真实，主将从现要遵从；Р 条件句非真实，虚拟语气用到位。Рif 条件状语从句的时态练习 Р一．在正确的答案下划一条线。Р1.Daina ( will go/go/goes) to Europe if she (will pass/pass/passes) the exams .
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