There are many irregular verbs. We have practiced these quite a bit.
The past simple of to be is extra irregular:
| + | - | ? | |
| I | was | wasn't | Was I? |
| You | were | weren't | Were you? |
| He / She / It | was | wasn't | Was he / she / it? |
| We / You / They | were | weren't | Were we / you / they? |