用it is pleasure doing sth造句

用it is pleasure doing sth造句 it is no pleasure doing造句 it is difficult doing.sth造句 It is a pleasure to do sth. 用there is sb /sth doing sth,stop sb (from) doing sth造句 用It's time to do sth 和It's time for doing sth 造句 make it possible by doing sth造句 It 's no pleasure doing这个句型,为什么动词要用ing形式呢?为什么不用to do sth. 用practice doing sth.造句 用enjoy doing sth造句 用practice doing sth造句 用like doing sth造句