Odpowiedź :
1 There is the possibility of a maths test next week.
HAVE
We might have a maths test next week.
2 He needs to get good results or he won't get into university.
DOES
He won't get into university if he does not get good results.
3 Have they planned to visit Greece this summer?
GOING
Are they going to visit Greece this summer?
4 She'll pass the exam if she studies harder.
NOT
If she doesn't study harder, she will not pass the exam.