Question

Passe para a forma negativa :
They studied math

You walked to school

He played soccer

I closed the door

Obrigado desde já

Answer 1

They DO NOT studied math.

You DO NOT walked to school.

He DOES NOT played soccer.

I DO NOT closed the door.

Espero ter ajudado amigo.

Answer 2

Na forma negativa do tempo simple past usa-se o verbo auxuliar DID + NOT (ou a contração DIDN'T) + VERBO PRINCIPAL NO PRESENTE.

Então temos:
They didn't study math.
You didn't walk to school.
He didn't play soccer.
I didn't close the door.