Поставьте следующие предложения в отрицательную и вопросительную формы: 1. the plane for moscow left on time. 2. he asked a porter to help him. 3. he will be at the airport two ours before departure. 4. we registered our luggage.

1 Did the plane for Moscow leave on time ?
The plane for Moscow didn't left on time.
2 Did he ask a porter to help him?
He didn't ask a porter to help him.
3 Will he be at the airport two ours before departure?
He won't be at the airport two ours before departure.
4 We didn't register our luggage.
Did we register our luggage?