what should you do when you your ---- your experiment?have finished

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whatshouldyoudowhenyouyour----yourexperiment?havefinishedwhatshouldyoudowhenyouyour----yourexperimen

what should you do when you your ---- your experiment?have finished
what should you do when you your ---- your experiment?
have finished

what should you do when you your ---- your experiment?have finished
what should you do when you __have finished___ your experiment?
译一下:当你完成了试验的时候你应该干什么?
后半句是时间状语从句,用现在完成时来表示完成这个实验的时间对我们要做what should you do这个决定的影响,所以这里用现在完成时是绝对正确的!

当你的实验结束的时候你必须干些什么?
不能用过去式,因为实验结束对你必须干些什么还有持续的影响

when 翻译为 “在……之后”,前面是一般现在时do,所以后面应当用现在完成时。