You shouldn't run., You shouldn't swim here., You shouldn't drop litter., You couldn't take photos whan he was 4., You shouldn't feed the animals., You should wash your hands., You should wear a mask., You should keep this distance., You should eat healthy food., You should exercise to keep fit., You should get enough sleep., Paul could run fast when he was six., Clare could read when she was five., Paul could swim when he was seven., Clare couldn't ride a bike when she was seven., Paul could speak English when he was twelve., Clare could speak Japanese when she was twenty., Paul couldn't send e-mails when he was seven.,

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