1. When I will get to work I might phone you. (will)

2. I would never have guessed he was that old. (correct)

3. He has been visited the hospital. (been)

4. My English has improved until I had to go back to my country. (has)

5. He had been working for the company for 20 years when they made him redundant. (correct)

6. I would help you if I did have more time. (did)

7. The film must had finished by the time they arrived. (must)

8. The man claimed the stolen goods had been placed in his pocket by the police.
(correct)