Put the verbs in the right form

1. My friend 1)_____ (to change) a job since I last 2) (to see) her.
2. Grandfather’s health 3) ______ (to get) worse and worse.
3. My brother looks upset. He 4) ________(to burn) the potatoes.
4. I 5) _______ (to know) the answer to your question.
5. We 6) _____ (not to see) each other for ages.
6. By one o’clock he 7) ________ (to answer) all the letters.
7. He 8)________ (to play) football, when he 9) ______(to break) his arm.
8. When she 10) _______ (to arrive) at the office she11) _________ (to discover), that she 12) _______(to forget) all the necessary papers at home.
9. If it 13) _______ (to snow), they14) ________ (to go) skiing.
10. I think, I 15) _______(to go) home now.