Exercise 13. Explain why can't (couldn't) this be done. Follow the model
Example: Why can't you do it now? (go home)
- Because I must go home.
Why couldn't you do it yesterday?
- Because I had to go home.
1. Why can't she go to the cinema? (stay with the baby). 2. Why can't you help me? (do some work). 3. Why couldn't they leave college? (prepare for classes). 4. Why can't she give me a book? (read it herself). 5. Why couldn't they translate the text? (write out the new words). 6. Why couldn't we leave for Moscow yesterday? (wait for our father). 7. Why can't the man stay longer? (be at his office). 8. Why couldn't he ride the bike? (mend it). 9. Why couldn't the plane arrive in time? (make an extra landing). 10. Why can't they spend all the money? (save some for the next month).

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