ever & never 的用法...

never
[5nevE(r)]
adv.
从未；永不；决不
I have never been there.
我从未到过那里。
He never has anything to do.
他一向无所事事。
Television has been popularized as never before.
电视已经空前普及。
I never catch anything - not even old boots.
我从未钓到任何东西--连旧靴子也钓不着。
That will never do.
那决不行。
不，不要
Never too Old to Learn is an idiom.
'活到老学到老'是句成语。
Never offer to teach fish to swim.(谚)
不要班门弄斧。
Never fear!
别怕！
This shirt will never do!
这件衬衫不能穿！
She never said a word the whole two hours.
整整两个小时她一句话也不说。

ever是曾经,never是未曾,含否定意思.它们常用于现在完成时,
-Have u ever been to Beijing?
-No,never.

never 是从不,未曾,用于现在完成时的否定句
ever是曾经,用于现在完成时的一般疑问句或者特殊疑问句,也可以用于肯定句
两者皆可用于*的句子中
this is the best film i have ever seen
this is the best film i have never seen