句型转换。
1. My father began to learn football when he was ten years old. (就画线部分提问)
______ ______ your father ______to learn football?
2. I spent 3 hours doing the work last Sunday.(改为同义句)
It ______ 3 hours ______ the work last Sunday.
3. He started to learn English when he was 10.(就画线部分提问)
______ ______ he ______ to______ when he was 10?
4. My sister walked to work last Monday.(改为同义句)
My sister______ to work on ______ last Monday.