Is it possible to use the present perfect with subjunctive:
It's important that you haven't eaten the cake until we come back.
I don't follow you. Where is the subjunctive clause that you mentioned? Incidentally, your example is not natural.
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I don't follow you. Where is the subjunctive clause that you mentioned?
Incidentally, your example is not natural. We would normally say:
It's important that you haven't eaten the cake by the time we come back.
OR
It's important that you don't eat the cake until we come back.