oi!

a. I study at night → i studied at night

b. She works with her mother → she worked with her mother

c. I go to the beach with you → i went to the beach with you

d. We meet at school → we met at school

e. Mary sits near me → mary sat near me

f. I write letters to my friends → i wrote letters to my friends

g. They study in the same class → they studied in the same class

h. He sends flowers to his girlfriend → he sent flowers to his girlfriend

espero ter ajudado! <3