oraciones afirmativas-negativas e interrogativas utilizando el auxiliar could

A= I could go to the movies on Saturday.
N= I couldn‘t go to the movies last Saturday.
I= Can I go to the movies on Saturday.

A= I could go to play soccer this Thursday.
N= I couldn‘t go to play soccer last Thursday.
I= Can I go to play soccer this Thursday?

A= I could do my history homework.
N=I couldn‘t do my history homework.
I= Can I do my history homework?