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这句话不对，但可以有以下修改方法：
1、I hear that he swam in the sea yesterday.
2、I hear that he was swimming in the sea at nine yesterday.(过去进行时需要有明确的时间状语)
1、I hear that he swam in the sea yesterday.
2、I hear that he was swimming in the sea at nine yesterday.(过去进行时需要有明确的时间状语)
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