只后跟do的单词情态动词除外,

feel sb.do sth.感觉某人做某事
have sb.do sth.使某人做某事
hear sb.do sth.听见某人做某事 也可加doing
let sb.do sth.让某人做某事
listen to sb.do sth.听着某人做某事用的较少 一般都用hear
look at sb.do sth.看着某人做某事
make sb.do sth.使某人做某事
notice sb.do sth.注意某人做某事
observe sb.do sth.观察某人做某事
see sb.do sth.看见某人做某事 也可加doing
watch sb.do sth.观察某人做某事 也可加doing

貌似除了情态动词 没有了
作情态动词时，用do.
作行为动词，用to do

why not do had better to let/ make/ have sb. do hear/ watch/ see...sb. do(指过程)
help sb. do/ to do