ㄴ/는다고 - after verb and follow with (saying verb 하다,말하다 ...) 이라고 - come after noun and follow with (saying verb 하다,말하다 ...) 이라는 - comes after noun and follow with noun and (saying verb 하다,말하다 ...) (으)라고 - comes after verb and follow verb ( use for imperative sentences ) All of the above is right. You must distinguish between imperative in indirect quotation and imperative in main sentence. 집에 간다고 하세요. Please tell him/her/them that you go home. (imperative in main sentence) 집에 간다고 했어요. I said that I go home 집에 가라고 하세요. Please tell him/her/them to go home. (imperative in main sentence and indirect quotation) 집에 가라고 했어요. I told them/him/her to go home. (imperative in indirect quotation) Also refer to http://www.italki.com/question/267799