you can only learn if you pay attention

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：英语作业时间：2024/07/12 21:06:05

you can only learn if you pay attention
这个if后面是不是条件状语从句,如果是,是否跟主将从现这个原则有关系.

是条件句.条件句的原则除了主将从现之外,还有：主祈从现和主情从现.这里是主情从现,即：主句是情态动词.
再问：还有没有别的原则，麻烦给说说
再答：还有一种情况是主句也用一般现在时的，也称零条件，也就是说无需条件的，必定会发生的，如： If you don't put milk in the fridge, it goes bad. 天热，牛奶不放冰箱，必定会变质。但是初中英语不作要求。希望对你有启发

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