when we want to talk about something that someone else did for us or for another person
HAVE SB DO STH
CAUSATIVE VERB HAVE/GET
when we are talking about paying someone to do something for us. It's often used for services.
HAVE/GET STH DONE
HAD BETTER
we talk about the person who we asked to do the thing for us
we needed to convince someone to do something
GET SB TO DO STH
to talk about actions we think people should do or which are desirable in a specific situation
CAUSATIVE VERB