Ответ:
1) If you don't work systematically you fail the exam.
2) If she know English, she will try to enter the university.
3) If he didn't come on time, we would wait him.
4) If the fisherman had been less patient, he would have caught so much fish.
Объяснение:
Zero:
[If + Present Simple], + [Present Simple]
First:
[If + Present Simple], + [Future Simple]
Second:
If + Past Simple], + [Would+Bare Infinitive]
Third:
[If + Past Perfect], + [Would + Have+V³]