"每天都很开学"可以用英语表达为"it's always a school day"或者"every day is a school day." 这个表达的来源可能是源自谚语"every day is a learning day," 它的意思是每一天都是一个学习的日子，强调人们应该每天都保持学习的状态。
例句：
"I try to stay curious and keep learning, because it's always a school day." (我尽量保持好奇心，并不断学习，因为每一天都是一个学习的日子。)
"I bepeve that every day is a school day, and there is always something new to learn." (我相信每一天都是一个学习的日子，总有新东西要学。)