Use a suitable present or past MODAL AUXILIARY:
11. I can’t find the house. I ………………………………………….. (write) down the
address.
12. She is very sleepy. She ……………………………………. (stay) up very late last night.
13. I ………………… go for a walk later. It depends on the weather.
14. The ground is covered with snow. It ………………………………………… (snow) last
night.
15. She …………………………………… (be) in a great hurry to leave for the theater
because she left all the dinner dishes on the table.
16. That store has just gone bankrupt. I believe they ………………………………… (have) a
stricter policy about giving people credit.
17. I’m afraid Mr. Smith is deaf. He ……………………………………… (not / hear) what
you say.

11. I can’t find the house. I should have written down the address. 12. She is very sleepy. She shouldn't have stayed up very late last night. 13. I may go for a walk later. It depends on the weather. 14. The ground is covered with snow. It must have been snowing last night. 15. She must have been in a great hurry to leave for the theater because she left all the dinner dishes on the table. 16. That store has just gone bankrupt. I believe they should have had a stricter policy about giving people credit. 17. I’m afraid Mr. Smith is deaf. He must be unable to hear what you say.