when use were

"Were" is the past plural form of be form verbs.It is used after the plural pronouns or nouns.It's also used to make the interrogative sentences.We can use before the pronouns I(in case of 2nd condition),we, you &they. eg:- 1)If I were a bird I would fly. 2)We were playing outside when the drone camera came. 3)You were sleeping when the class began. 4)They were playing cricket. Interrogatives:- 1)Were they write online test yesterday? 2)Were you seeing movie last night?