I were

I was there is a perfectly correct grammatical statement. The verb to be is an irregular verb, which is a verb that does not follow any pattern or rules in its conjugation

2022-12-08
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  1. used when you give someone advice: 3
  2. If I Was vs
  3. The word were in the phrase if I were you is special form
  4. were I to be
  5. If I were is used to express an imaginary situation in the present
  6. Notice that this special form is only used in the if-clause
  7. If I were you, I would explain what happened
  8. Lets help to clear up the confusion
  9. id stay away from that camera if i were you