different between if conditional and without if

1. CONDITIONAL SENTENCES WITHOUT IF
Type 1: Possible to happen in the future
Pola : should + S + V1 + O, S + WILL + V1 + O
1. Should you study hard, you will be successful.
2. Should I have enough money, I will go to Bali.
3. Should you need my help, I will help you
Type 2 : Impossible to happen now
Pola : WERE + S + complement , S + WOULD+ V1 + O
1. were I you, I would go home now.
2. weren’t I sick now, I would help you.
3. were My English teacher absent today, I would study at library.
Type 3 : Impossible to happen in the past
Pola : HAD + S + V3 + 0 , S + COULD + HAVE + V3 + O
1. had I studied here yesterday, I could have met you.
2. had you studied last night, you could have done this test.
3. had you not smoked in school, your teacher wouldn’t have been angry
with you.
4. had I studied at Medical Faculty some years ago, I would be a doctor
now.