have sth done与have sb do sth与 have sb doing sth区别

Question

have sth done与have sb do sth与 have sb doing sth区别

Answer 1

have sth done 让别人去做这件事,(某件事被做)
e.g.I'll have my hair cut.我打算去理发.
have sb do sth.让某人做某事,have是使役动词,后边要省略动词不定式to
have sb doing sth.让某人持续做某事,强调"持续"
e.g.He has us waiting for a long time.