Bonjour
dans les phrases avec If si la proposition principale est au conditionnel simple, la subordonnée conditionnelle (avec IF) est au preterit
1- If he started earlier, he would finish on time.
2- If you worked harder you would do well on the test.
3- If she knew who he was, she wouldn't love him.
4- If I were you, I wouldn't do it.
Bonne journée ☺☺☺