yesterday he swam in the sea .是病句吗,怎么改

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• I hear that he swam in the sea yesterday?这句话对吗?swam可以换成swim,swimming吗?有啥不同?hear后不是只有动词原型,现在分词两种形式吗?是不是I hear that he swam in the sea yesterday?是宾语从句，而用swim，swimming时是宾语补足语，是不能加that一词的？I heard he swim in the sea yesterday?I heard he swimming in the sea yesterday?这两句对吗
• yesterday he swam in the sea .是病句吗,怎么改
• I hear that he swam in the sea yesterday?这句话对吗?swam可以换成swim,swimming吗?有啥不同?
• yesterday he swam in the sea .是病句吗,怎么改
• We were go to school early yesterday.和She was buy a dress last week.是病句吗,怎么改?
• We were go to school early yesterday.和She was buy a dress last week.是病句吗,怎么改?
• Translate:Statement Negations
• 1、我国古代将炉甘石（ZnCo3）、赤铜（Cu2）和木炭粉混合后加热到约800°C,得到一种外观似金子的锌和铜的合金,试写出反应的化学方程式（提示：ZnCO3加热可分解为ZNO）.