use的用法.used to do sthbe used to do sth be used to doing sth

used to do sth 习惯于做某事
be used to do sth被用于做某事 （被动语态）
be used to doing sth过去常常做某事
be used for (doing )sth 也是被动语态,被用于做某事
be used by sth 某物被用于.