Unfortunately you'll have to pay the fine before you check those books out.这句话里面的语法有些什么

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Unfortunately you'll have to pay the fine before you check those books out.
这句话里面的语法有些什么

这句话里面的语法有些什么
1.before引导的时间状语从名句.
2.主句是是一般将来时“you'll have to pay the fine ”
从句是一般现在时“.before you check those books out”
3.have to 是词组,不得不,必须的意思.
4.Unfortunately 是插入语,不作任何成分.

不幸的是,在把这些书借出去(或买走)之前,你得交罚款。

但不幸的是,你要先付清罚款在你借书之前。