最大区别在于:from then on 单独使用:From then on he worked harder.可置于句首或句尾; ever since 则后面还须加时间词语:He's been here ever since Monday. 而另外一种用法也容易搞混(可能你说的是这种):就是ever since 单独使用:Have you been living there ever since?与Have you been living there from then on?但这两句差异也是明显的:前者"你是不是一直住在那里?"后者"从那时起你是不是一直住在那里?";显然后者多了一个限定"从那时起" 倒是ever since then 与 from then on一样意思
