Do you understand what you are to do now? (question words + to-infinitive)

1. Do you understand what you are to do now? (question words + to-infinitive)

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2. You have to tell me when I should press the button. (question words + to-infinitive)

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3. I can’t decide whether I should wear the red dress or the black one to the party. (question words + to-infinitive)

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