这条河曾经很干净英文怎么说
时间：
这条河曾经很干净英语可以说成 "this river used to be clean."
"used to be" 是一个短语动词，它表示过去曾经是某样子，但现在不是了。
例句：
This city used to be quiet, but now it's very noisy. (这个城市曾经很安静，但现在很嘈杂)
He used to be shy, but now he's very outgoing. (他曾经很害羞，但现在很外向)
That store used to be open 24 hours, but now it closes at midnight. (那家商店曾经24小时营业，但现在在午夜关门)
"used to be" 是一个短语动词，它表示过去曾经是某样子，但现在不是了。
例句：
This city used to be quiet, but now it's very noisy. (这个城市曾经很安静，但现在很嘈杂)
He used to be shy, but now he's very outgoing. (他曾经很害羞，但现在很外向)
That store used to be open 24 hours, but now it closes at midnight. (那家商店曾经24小时营业，但现在在午夜关门)