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.