It was used for actions that were happening at a specific time in the past. Subject Verb to be Verb+ing You They We were Wrting, Reading, Listening......etc I, He, She,It was Writing, Reading, Listening......etc Afirmative sentences Subject + auxiliary verb (to be) + verb+ing. Negative Sentences Subject + auxiliary verb (to be) + "not" + verb+ing. Interrogative Sentences Auxiliary verb (to be) + subject + verb+ing? Uses 1.It is used for an action in development in the past when another action interrupts it. 2.To talk about actions at a specific time in the past. 3.For two actions that were occurring at the same time in the past.