找不到的用法和样例：
例句
-
我们翻遍了文件夹，怎麽也找不到那封信。
We raked around in the files, but couldn't find the letter. -
我们怎麽也找不到一间旅馆客房。
We couldn't find a hotel room for love or money. -
清洁工把我的文件弄乱了，我找不到我要的那份了。
The cleaner had muddled my papers, and I couldn't find the one I wanted. -
我们（各处）找了半天，却找不到那本书。
We searched (around) for hours, but couldn't find the book. -
她翻遍了手提包，就是找不到钥匙。
She foraged (ie rummaged) about in her handbag, but couldn't find her keys.
