every和once的用法区别奥运会四年举办一次是：The Olympic games are held every four years.但是能不能说：The Olympic games are held once four years.有没有什么特定的规则呢?
问题描述：
every和once的用法区别
奥运会四年举办一次是：The Olympic games are held every four years.
但是能不能说：The Olympic games are held once four years.
有没有什么特定的规则呢?
答
every 是形容词
而 once 是名词或介词
两者意思不一样
答
every表示 每隔..,没有“一次”的含义.比如 every other line.每隔一行.every four years每隔四年.
once是可以表示一次.比如once a week 一周一次.
如果你真想用once.那就用hold once in four years ,但不能用once four years