Answers:

1. They may/might have gone to the cinema.
2. They must have gone, but we are not sure.
3. I won’t be able to be there on Sunday
4. You should have seen it
5. She would have painted the house if she had had time
6. You should have called her.
7. I must have explained it to her/ I had to explain it to her.
8. I could have done something else
9. He must have inherited a lot of money
10. I wasn’t able to go out of the office earlier/before. I couldn’t go out of the office earlier/before

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