Английский 4 класс, заранее спасибо

1) a) My mum usually washes the floor
    b) My mum has already washed the floor
2)a) Beyonce usually sings a song
   b) Beyonce has already sung a song
3)a) My brother usually makes a funny video with my cat
   b) My brother has already made a funny video with my cat
4)a) I usually write a letter to my grandmother
   b) I have already written a letter to my grandmother