Вопрос по английскому языку:

Complete these sentence with the verb ski in the correct form
1. I go ________ every winter.
2. I started ___________ when I was six.
3. I tried ____________ down the mountain, but it was two steep.
4. My instructor made me ___________ down the steep mountain.
5. I enjoy ___________ very much.
6. Dave used ___________ when he was younger, but not any more.