still可以表示“仍然”,此时是一个副词,如：
He was then still young.
他当时还年轻.
还可以表示“更”如：
You are tall enough,but he is still taller.
你的个子够高了,可是他更高.
另外,still还可以用作形容词,表示“静止的,平静的”如：
a still night
寂静的夜晚
Please keep still while I take your photograph.
我给你照相时你别动.
still 还可以用作动词,表示“使静止,使平静”如：
The mother stilled the crying baby.
母亲使婴儿止哭 .
一、要表达“还、仍然”的意思时,肯定句和疑问句用still.
He was still quite young.He is still working here.
Is he still working here?He will still be here next Saturday.
“还、仍然”的否定意思有两个.一是“不再”（指一种习惯或一种重复动作的终止）.
用no longer (not any longer,no more ,not any more)
He isn't working here any more .I am no more tined.
一是“仍然不”（指无变化的持续）,用still+动词的否定形式
You're still not doing it night.=You still aren't doing it night.
He still hasn't answered my question.
ever 一般用在疑问句中与完成时结合使用表示持续状态
该句子是完成时态 与 ever连用 并且没有持续到现在意思不用still