Сделать упражнение из прикрепленной картинки

1.if he invites Julia to the party, he will see her this evening.
2. if he wants to finish the report, he will stay in the library tonight
3/ after they pass the exams they will have a holiday
4.if the hotels full i will say at my friend`s....
5.after we consult the electrical engineer we will buy a new computer