Going To vs. Supposed To
Was going to We use a past form of be + going to when we talk about a plan we had that may have changed. A:You’re not staying out in this rain, are you? B:Well I am going to, yes. B definitely intends to stay out in the rain. B:Well I was going to, yes. B intended to stay out but may have changed his mind.
Was supposed to To be supposed to is a common phrase that functions the same way a modal verb does. Modal verbs, also called auxiliary or helping verbs, add meaning to the main verb in a sentence by expressing possibility, ability, permission, or obligation.