Какой тип условия следует употребить.1) Plants die if you (not water)

Какой тип условия следует употребить.
1) Plants die if you (not water) them
2) If you finish your homework , we (go) out
3) If he (come) to the party, he would have had a great time
4) If i were you , i (clean) the oven before you use it
Прошу помогите!