Resposta:
Para passar um verbo regular para o passado simples (simple past) deve-se acrescentar: -ed, -d ou -ied. Os verbos irregulares têm conjugações próprias.
a) I studied at night.
b) They went to school on Wednesday.
c) Every child liked to play videogame.
d) We sang songs all together.
e) Light travelled at almost 300.000 kilometers per second.
Espero ter ajudado :)