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