1) We saw very big animals that lived many,many years ago.
Did we see very big animals that lived many,many years ago? - общий
What animals did you see? - специальный
2) We learned a lot of interesting things about animals.
Did you learn a lot of interesting things about animals? -общий вопрос
What did you learn about animals? - специальный
3) We went home at one o'clock in the afternoon.
Did you go home at one o'clock in the evening? - общий
When did you go home? - специальный вопрос.