look forward to doing sth和look forward to do sth的区别?

look forward to doing sth和look forward to do sth的区别? look forward to do/ 还是 doing sth look forward to (doing )sth look forward to (doing) sth. look forward to和look forward to doing的区别 还是不懂,look forward to do和 look forward to doing用法的区别 有look forward to sth. 1,look forward to doing sth.2,hope to do sth 期待某人去做某事 look forward sb to doing sth 和expect sb to do sth 都 look forward to doing和looking forward to do 关于look forward to doing sth和get along with sb的理解 有没有look forward sb to do sth