求day off的复数形式用法。比如：她请了七天的假来照顾她妈妈。She asked seven days'off to look after her mother.p 这里用seven day's off对不对。求解释。还有：在国庆节期间，我们有七天假期。We have seven days off during the National Day Holiday.这里用 seven days off对不对？这两种day off的用法区别在哪，怎样在做题当中迅速区分。
day off 是一个固定词组“休息日，假期”比如你说的seven days off seven days'off 是指离开了七天，不是法定假期或者休息日，是有特殊原因的请假，两者在句中意思不同。 We have seven days off during the National Day Holiday。这里是对的。 你做题时可以通过句意来分辨