6. The teacher came at 9 o'clock. Negative: Question:

6. The teacher came at 9 o'clock. - Учитель пришел в 9 часов. Negative: The teacher **did not come** at 9 o'clock. - Учитель не пришел в 9 часов. Question: **Did** the teacher **come** at 9 o'clock? - Учитель пришел в 9 часов?