Until a better informed person answers, I hope this will be helpful: (1) Most causative verbs (order, cause, force, get, etc.) take TO. (2) Two big exceptions are "make" and "have" (3) Two popular but non-causative verbs don't take "to": "let" and "help" (BUT you may use "to" after "help." (3)SOME verbs in objective complement constructions don't take "to": I HEARD the man laugh (feel, observe, s