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If引导条件状语从句
语法：
例句：If people obey the traffic rules, there will be fewer accidents.
if引导条件状语从句
if:隶属连词，意思是：“假如，假如，倘若”
→从句
→主句
There will be fewer accidents if people obey the traffic rules.
原句可改为：
if引导条件状语从句既能够放在句子前，也能够放在句子后。 从句位于主句之前时，惯用逗号将其与主句隔开。
结构：
If it rains tomorrow, I will stay at home.
If you are hard-working, your parents may feel happy.
Study hard, if she wants to get good grades.
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