有must be used说法吗?如果有,请问题怎么用,used 后面跟for 还是on呢.

有must be used说法吗?如果有,请问题怎么用,used 后面跟for 还是on呢. This device must be used to prevent accidents.根据逻辑主语一致的说法,这句话有语法错误吗这是主动的Use this device to prevent accidents be used to doing used to doing?be used to doing used to doing?这两个词哪个正确?如果都正确那么他们有什么区别? be used to sb习惯某人 有没有这样的说法? be used to doing,be used to do,used to do,be used for,be used by有什么区别. there must be 有被动语态吗 Be used as 与be used for 有什么区别? be used for 和be used in有什么区别, must,must be有什么区别 be used by ,be used for,be used to 有什么区别? be used by ,be used for,be used to 有什么区别? be delighted in 有这种说法吗? you must be careful.为什么说careful没有be不能形成谓语,不是有must吗 求一首歌,有I must be stupid must be crazy must be和must have be有什么区别谢谢 used to do, be used to doing , be used to do 有什么区别? 有 get out of window 的说法么?有的话 还有 工作第一 可以说work must be first?为什么? 德语里有没有 can be used