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if if引导的条件状语从句引导的条件状语从句1.概念 条件状语从句是表示主句动作发生的前提或条件的从句，即“在.条件下某事才能发生”。通常有连词if或unless引导。2.位置 if引导的条件状语从句可位于主句之前或之后。位于主句之前要用逗号与主句隔开；位于主句之后，中间不必用逗号。引导的条件状语从句的时态 在含有条件状语从句的复合句中，从句的时态在一定程度上受到主句时态的制约，这在英语语法中为时态呼应。（1）如果主句是一般将来时，从句必须用一般现在时代替一般将来时。（2）如果主句含有must，may，can等情态动词，从句须用一般现在时。（3）如果主句是祈使句，从句须用一般现在时。“主将从现”“主情从现”“主祈从现”1.If it doesnt rain tomorrow,we will go to the park.如果明天不下雨，我们就去公园。2.If you cross the road,you must be careful.如果你横穿马路，你一定要小心。3.Please call me if you come to my house tomorrow.如果你明天来我家请给我打电话。if条件状语从句练习题1.If you _(feel)tired,you _(have)to relax.2.What _(happen)if they _(go)to the concert?3.If there _(be)fewer trees,there _(be)more pollution.4.If the weather _(be)fine,we _(go)for a walk.5.If she _(get)up late,she _(not catch)the early bus.6.If _(rain),we _(stay)at home.feelwill havewill happengoarewill beiswill gogetswont catchrainswill stay7.If the boy _(become)a soccer player,he _(be)happy.8.If she_(not call)me up,I _(go).9.We _(not have)our sports meeting if the weather _(be not)fine.10.He _(come)if you _(invite)him.11.You_(be)late if you_(not ride)your bike.12.You _(not get)good grades if you _(not study)hard.becomeswill be doesnt callwill go wont have isnt will come invitewill be dont ridewont get dont study
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