1. It’s very important for parents to help build a child's independence by encouraging good habits.
2. We were very impressed by her effort to overcome difficulties.
3. My friends have studied English for fifteen years.
4. They haven't written to each other for five years
5 He has learned English since he was in grade 6.
6. I last visited the museum three months ago.
7. Tom has been ill for 3 days.
8. We started working on this program five years ago.
