No.16041
“Was“ and “were“ are both simple past tense forms of the verb to be, but they are not interchangeable.
“Was“ is the regular singular simple past tense form of to be for both the first person (“I was”) and the third person (“he was”).
“Were“ is the regular second-person singular simple past tense form of to be (“you were”) and all plural simple past forms (“they were,” “we were”).