use for釋義：
某物有什麼作用用於…
例句：
I'm sure you'll think of a use for it.
我相信你會給這東西找到用途的。
use to釋義：
過去常常
例句：
You can throw those away—they're no use to anyone.
那些東西你可以扔了—它們對誰都沒用。
use for的意思是用於作…用。例如：This administrative calendar was much easier to use for things like scheduling taxes and other things that had to be paid on time. use to的意思是過去常常用途習慣。例如：I use to feel very aligned to journalists.
use to do強調利用手段達到目的，是有計劃，有意識的.而use for doing是（某物）的直接效用，沒有“陰謀策劃（這樣說不很恰當，但便於你理解）”在裏面.
