When to use were
Whereas was is the singular past tense of to be, were is used for both the third person plural past tense (they and we) and the second person past tense (you). In the past indicative, were acts similar to was. “They were at the store,” you could say, for example.
Were and was correct usage?
Generally, “was is used for singular objects and “were” is used for plural objects. So, you will use “was” with I, he, she and it while you will use “were” with you, we and they. ... Even though you are singular, you must use “were”.
Is if it were grammatically correct?
“If I was” and “If I were” are often used interchangeably even by native English speakers, but which one is correct? The short answer: they're both right AND wrong.