2. Change "catching" to "caught": and Betty caught it when it came down.
3. Change "buys" to "bought": Linda has worn her new yellow dress only once since she bought it.
4. Change "got" to "was getting": Last week Mark told me that he was getting very bored with his present job.
5. Change "sat" to "sitting": Having fed the dog, he was sitting down to his own meal.
6. Change "delete" to "deleted": When I turned on my computer, I was shocked to find some junk mail, and I deleted it all.
7. Change "so" to "neither": They are going to have to leave soon and so do we.
8. Change "has told" to "told": The boss laughed when the secretary told him that she really needed a pay rise.
9. Change "stop" to "stopped": The telephone rang several times and then stopped before I could answer it.
10. Change "since" to "for": Debbie, whose father is an excellent tennis player, has been playing tennis for ten years.
11. Change "went" to "go": I have seen lots of interesting places when I go on holiday last summer.
12. Change "listen" to "listening": When my cat heard a noise in the bushes, she stopped moving and listened intently.
13. Change "change" to "changed": I think it's time you changed your way of living.
14. Change "is" to "was": Roger felt the outside of his pocket to make sure his wallet was still there.
15. Change "ran" to "run": When I'm shopping in the supermarket, I run into an old friend who I hadn't met for five years.
16. Change "is having" to "was having": The police arrested the man while he was having dinner in a restaurant.
17. Change "are married" to "have been married": Peter and Wendy first met in 2006, and they have been married for three years now.