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11the question was very hard .we couldn't answer it 
12. you're very young .you can't drive that car 
13. she was tired .she didn't go any where 
14 these shoes are very small . i can't waer them 
15. he is so weak .he can't run 
16. the sun is not wam .we can't live on it 
17 the water is quite warm .  can drinl it 
18 . the weathe ris very bad . we can't go out 
19. the film was quite boring .we couldn't go on seeing it 
20. he wa very old .he couldn't run fast