想写个句子,其实是两个合成句的从句,1）A is used to/for do/doing sth;2)A includ

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想写个句子,其实是两个合成句的从句,1）A is used to/for do/doing sth;2)A includes.从句中be可省吗
A used for doing sth includes.be可省吗还是要A being used for.；这里be used for 和be used to 想表达的意思是：一个用来干嘛的东西它包括什么的一个句子.语法全忘了- -总觉得那个be可省略.

先弄懂短语意思和结构
used to do 过去常常
be used for+n名词/doing 被用来做
be used to do 被用来做
be used to doing 习惯与.
回过来：你上面的问题要看句意.才能说是表被动还是习惯.
再问：你说的短语我都懂。。。谢谢~我说清了句意，我想表达的是被用作，被用作修饰主语，然后主语包括什么，想问这是的be是否可省
再答： A used for doing sth includes。。。。主语可以是名词/代词。the book used for reading are on the desk. 这时候短语做定语。可以省略。但是the book is used for reading. 就不能省略了。
再问：知道了~我说的就是第一种~谢谢！是不是也可以 the device used to do sth is 。。。。
再答：可以

use的用法.used to do sthbe used to do sth be used to doing sth be used to do sth.be used doing sth.for one to talk to . be used for doing sth和be used to do sth一样吗? 英语句型区分be used to do Sthused to do Sthbe used for doing Sth Be used to do sth Be used to doing sth 后者的to为何做介词? be used to doing sth.和used to do sth.的分别用 used to,be used to do,be used to doing 各造两个句子求些英语句子组合比如is doing sth ；sb to do sth；enjoy doing sth这样的 get used to doing sth.的否定句造句It is+a.+for sb.+to do sth. prepare的用法是prepare for doing sth还是prepare to do sth有何区别 make a plan to do sth.还是doing sth.