1.
have ever done,
ever 在肯定句中,一般是比较事物的时候用于强调.
have ever done 这个,应该是常见用做定语从句.我曾经.过的...
He is the tallest boy I have every met.
2.
have never done 代替not,强调否定句
3
一般意义上的,曾经,发生过,做过,不做比较时,不是用ever 这个词,而是：
once,
at one time,
before,
甚至,句中都找不到一个’曾经‘这个词,而是用
used to do ,
过去时,完成时来表达您举的那个例句He is the tallest boy I have ever met，我觉得换成have never done也说得通啊，能举一个用have never done的例句吗，谢谢！This is something I have never done in any of my books. I have never done a romantic film before. ' I came home and I have never done anything like it since.