动词：use sth to do sth = use sth for doing sth 把某物用于做某事
be used to do sth = be used for doing sth 用于做某事
be/get used to doing sth 习惯于做某事
used to do sth 过去常常/曾经做过某事
名词：make use of 利用 = put sth to use
in use 在使用中
come into use 开始被使用