11. The clock is slow. — It isn't slow, it (stop). 12. He (leave) for Canada two years ago and I (not see) him since. 13. This is the fifth cup of coffee you (have) today! I4.lt is the most beautiful place I (visit). 16 I (not...

 11. The clock is slow. — It isn't slow, it (stop). 12. He (leave) for Canada two years ago and I (not see) him since. 13. This is the fifth cup of coffee you (have) today! I4.lt is the most beautiful place I (visit). 16 I (not see) Nick lately. Anything (happen) to him? ~- Yes, he (get) into an accident three weeks ago. Since that time he (be) in hospital. 16. Why you (switch on) the light? It isn't dark yet.