There are a lot of irregular verbs in English. Here is a list of the most common that you should learn:
I ran | I spoke | I won |
You ran | You spoke | You won |
He ran | He spoke | He won |
We ran | We spoke | We won |
You ran | You spoke | You won |
They ran | They spoke | They won |
Except, the verb to be:
I was |
You were |
He was |
We were |
You were |
They were |