Hello Cher, -Yes, both sentences can be use to refer that you are going home. Je dois rentrer & Je vais rentrer: Most of the time, those sentences imply that the person who is talking is going to his/her house, because they are use a lot in this kind of context, but it is not limited to. You can actually use those sentences when you just go inside a building, shop or any interiors Example: je dois rentrer (chez moi) or je dois rentrer (dans la boutique) -If you want to say “I want to go back” in any context, they are several way of saying it. Examples: - Je veux repartir dans ce cinémas : I want to go back in this cinema - Je veux revenir à Paris : I want to go back to Paris - Je veux retourner à la bijouterie : I want to go back in the jewellery store. Meaning -Repartir is coming from the verbe “partir: to go/to leave” and “re” refers to repeat something. repartir = go again -Retourner is coming from the verbe “tourner: to turn” With “re” repartir = turn again. Here it is more an expression of going back somewhere -Revenir is coming from the verbe “venir: to come” Revenir = come again Hope it will help you to understand.