Can you tell me when set off?求怎样改错并解释!

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Can you tell me when set off?求怎样改错并解释!
Can you tell me when set off?
求怎样改错并解释!

Can you tell me when set off?求怎样改错并解释!
Can you tell me when【 to set 】 off?
或:Can you tell me when【we will 】 set off?
when to do 结构,或:when 后跟宾语从句- 主语+ 谓语...
不明白的再问哟,请及时采纳,多谢!

when to set off········to set off 作状语,以TO引导····

when,what等加to作主语表语宾语等