Everyone should keep the environment(cleaning)?为什么不用clean?

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Everyoneshouldkeeptheenvironment(cleaning)?为什么不用clean?Everyoneshouldkeeptheenvironment(cleaning)?为什么

Everyone should keep the environment(cleaning)?为什么不用clean?
Everyone should keep the environment(cleaning)?为什么不用clean?

Everyone should keep the environment(cleaning)?为什么不用clean?
keep + doing sth .
固定用法

keep 后加名词或DOING