I can't find my pen

anywhere
anywhere - 任何一个地方
everywhere - 所有的地方
前者总是用于条件、否定和疑问等结构,而后者通常用于肯定结构.
例如：Did you go anywhere yesterday?昨天你到哪些地方去走走了吗?
Well,I can't find it anywhere．可是,我到处没有找到.
If you want to go anywhere,I shall be your guide．你想要到哪些地方去走走,我当你的向导好了.
I've looked for everywhere,but I can't find it．我到处都找过,可没有找到.
We must clean the house-everywhere looks so dirty．我们应该打扫一下屋子了,到处都是肮肮脏脏的.

anywhere
因为anywhere用在否定句的