1. The last time I saw her was 10 years ago.
    It's been 10 years since I last saw her.
    I last saw her 10 years ago.
2. When did you start teaching here?
3. A new style of jeans has just been introduced in the USA.
4. Two strange men were seen run out of the shop.
5. Why don't we use electricity economically?
6. I haven't finished reading this book yet.
7. A lot of homework was given to us by the teacher.
8. Daisy didn't clean the floor yesterday.
9. Tom had his house broken into last night.
10. My father doesn't smoke cigarettes anymore.
11. Mai doesn't play piano as well as Liz.