以before或after引导的状语从句有问!进入帮手例:It will be four days before they come back哪句系主句?哪名是从句?

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以before或after引导的状语从句有问!进入帮手例:It will be four days before they come back哪句系主句?哪名是从句?

以before或after引导的状语从句有问!进入帮手例:It will be four days before they come back哪句系主句?哪名是从句?
以before或after引导的状语从句有问!进入帮手
例:It will be four days before they come back
哪句系主句?哪名是从句?

以before或after引导的状语从句有问!进入帮手例:It will be four days before they come back哪句系主句?哪名是从句?
主句是 :It will be four days
before they come back 是时间状语从句
这里的before翻译成 要过多久才.
句意为:他们四天后回来.

It will be four days 主句
从句引导词before
they come back从句

before前是主句,before后是从句