宾语从句的从句部分要根据主句变形,主句passed是一般过去式,所以从句必须（客观事实“地球围着太阳转”等等除外）从过去时的门类里挑.can't 是现在时,其过去时中只有一个过去式couldn't,全称could not 要分开写.
结论：cannot变为 couldn't 或 could not
一道语法改错~They passed a ban that we cannot carry bottles.哪里错了?
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