Anonymous I know intuitively but cannot explain why use could instead of might in this sentence, if both express possibility: "When you have a small child in the house, you mustn't leave small objects lying around. " could be can be used instead of may/might be : I wonder where Tom is. ~ He may/might/could be in the library.
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Anonymous I know intuitively but cannot explain why use could instead of might in this sentence, if both express possibility: "When you have a small child in the house, you mustn't leave small objects lying around. Such objects could be swallowed, causing serious injury or even death."could be can be used instead of may/might be: