问题描述：
关于时间状语从句的问题.
是不是用after/when/before等引导的时间状语从句放在句首时与主句之间都要加“,”,而放在语句后就不用加“,比如：After they had entered the house,they went into the dining room./She went on holiday after she had taken the examination.
是不是用after/when/before等引导的时间状语从句放在句首时与主句之间都要加“,”,而放在语句后就不用加“,比如：After they had entered the house,they went into the dining room./She went on holiday after she had taken the examination.
问题解答：
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