4 For each question, complete the second sentence so that it means the same as the first, using no more than three words. a) We started working here three years ago. We've worked here. for three years. b) This is the first time I've been on a plane. ........ on a plane before. c) That's strange! My pen isn't here! That's strange! disappeared: d) Nicky and Jan aren't at this school any more. Nicky and Jan..... this school. e) I saw a friend of yours a few moments ago a friend of yours. ) I'm still writing my letters. ........ writing my letters yet. 8) Is this your first visit to South America? Have ......... ....... to South America before? h) Oh no! My wallet is still in the car. Oh no!!.... my wallet in the car. ) It's a long time since we spoke to your sister. ... to your sister for a long time. D) Is Anna still asleep? Has........ up yet? We