谁能帮我总结一下这些的用法谁能帮我总结一下usedto,beusedfor和别的含use的用法和区别‘‘

Question

谁能帮我总结一下这些的用法
谁能帮我总结一下used to ,be used for 和别的含use的用法和区别‘‘

Answer 1

be used as与be used for,be used to sth．／doing sth,be used to do sth.的区别：
be used as和be used for都意为"用作",不同的是as后通常接名词,for后多接v．-ing；be used to sth．／doing sth．意为"习惯于某事／做某事",to在这里是介词；be used to do sth．意为"被用于做某事"；used to do 意为"过去常常做某事",used to这里是助动词：e.g.
①During the war the castle was used as a prison．战争期间城堡用来作监狱.
②During the war the castle was used for keeping prisoners in．战争期间城堡用来监禁囚犯.
③I'm used to the noise．我对这噪音已经习惯了.
④I'm not used to getting up early．我不习惯于早起.
⑤Wind can be used to produce electricity·风可以用来发电.
⑥This river used to be clean．这条河以前是干净的.