Sure! Here are the rewritten sentences:

1. She has been ill with the flu for six days.
2. He stopped smoking in 2010.
3. I have been doing this exercise routine every day for the past 10 years.
4. I wonder when the treatment will begin.
5. How about going to the market to buy some fresh vegetables?
6. Why don’t we go to the cinema this weekend?
7. Don’t forget to raise your knees high when you jog in place.
8. How long ago did you start the treatment?
9. He stopped playing basketball three years ago.
10. He started cooking for the family 10 years ago.