used to do be used to do write to sb. hear from sb. it is suitable for sb to do sth make sb to do sth to one's surprise offer sb sth call on sb to do sth made by be distroyed get award in one's free time help orgnize activities teach sb to do sth study english by oneself coused by save one's life be polluted by recycle pape
be used to doing be used to do write a letter to sb hear from sb be suitable for sb to do sth make sb do sth feel surprised to do sth privide sb with food apeal to do sth be made of 那个 下面的 。。。