题目内容：

summer holiday与summer holidays的用法及区别
为什么有些加而又有些不加s呢?

优质解答

同意二楼wu5ziyi的说法.两者没有区别.但summer holiday与summer holidays做主语时要注意谓语动词,前者用单数,后者用复数.例句如下:Seven weeks'summer holiday every year is written into our school calender.每年...