1. I buy a dress
I bought a dress
I’ve bought a dress

2. I see my friend
I saw my friend
I’ve been seen my friend

3. He go to school.
He went to school
He has gone to school

4. She swims in the pool.
She swam in the pool
She has swum in the pool

5. I forget my phone number.
I forgot my phone number
I’ve forgotten my phone number