Ответы и объяснения

2.When i arrived at the airport, i saw that plane had taken off
3. When Peters mum asked him about his homework, he said that he have done.
4. When they got to Anns place, all guests have left.
5. By the time i got home from school, my grandma had cooked dinner.
6. When the teacher came into the classroom, puplis have learnd the results of the test.