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‘‘

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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‘‘

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‘‘
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‘‘

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‘‘
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.