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This document discusses using "could" and "couldn't" to talk about abilities in the past. It explains that "could" is used to talk about things people were able to do in the past, like "when he was 1, he could walk." It provides examples of affirmative sentences using "could." It also explains that "couldn't" is used to talk about things people were unable to do in the past, like "when she was 1, she couldn't speak." It provides examples of negative sentences using "couldn't." There are also activities where sentences are rewritten to replace verbs with "could" or "couldn't."










