The test could be very difficult.
Correct
Julia might calls her friend tonight.
Wrong (Julia might CALL her friend...)
He might goes to London this weekend.
Wrong (He might GO to London...)
Lucas might will play Fortnite on Friday.
Wrong. (Lucas might PLAY...)
Jason might read that book. It looks interesting.
Correct
J. K. Rowling may writes a new Harry Potter book.
Wrong (J. K. Rowling may WRITE...)
Minecraft could be the number one game next month.
Correct
I might be an actress in the future.
Correct
Juana may teaches English next year.
Wrong (Juana may teach...)
The students could visiting the museum next week.
Wrong (The students could VISIT...)
Karen don't may come to the party.
Wrong (Karen MIGHT NOT come...)
Bring your umbrella, it might rain later.
Correct
She could visiting her grandparents.
Wrong (She could VISIT...)