The engineer is explain the operation of this device now.

Составить специальный вопрос, отрицательное и вопросительное предложение

Is the engineer explain the operation of this device now?

The engineer isn't explain the operation of this device now

What is the engineer explaining  now? special question

The engineer isn't explaining the operation of this device now.

Is the engineer explaining the operation of this device now?

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