why do not you ask the teacher for help when you have trouble?是定语从句吗,如果是先行词是什么

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why do not you ask the teacher for help when you have trouble?是定语从句吗,如果是先行词是什么
why do not you ask the teacher for help when you have trouble?是定语从句吗,如果是先行词是什么

why do not you ask the teacher for help when you have trouble?是定语从句吗,如果是先行词是什么
这不是定语从句,这只是时间状语从句