Press the button after the red light is on.改为否定句但句意不变

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Pressthebuttonaftertheredlightison.改为否定句但句意不变Pressthebuttonaftertheredlightison.改为否定句但句意不变Pressthebu

Press the button after the red light is on.改为否定句但句意不变
Press the button after the red light is on.改为否定句但句意不变

Press the button after the red light is on.改为否定句但句意不变
Don't press the button until the red light is on.
在这里可以用not...until...,意思是:直到.才

Don't press the button until the red light is on.

don't press the button until the red light is on