1) If it's cold, I will need a heavier coat
2) what are you going to do if you have a holiday?
3) if I can go tomorrow,I will let you Know
4) If flowers don't get any water,they will die.
5)I will go to the party unless it rain
6) If I got up earlier,I wouldn't be late for work
7) If I didn't feel so tired,I would go out with you
8)If you didn't pass the exam ,would you take it again?
9) If I were You ,I would apply for the job
10) I could repair the car if had the right tools
11) If I had studied hard ,I would have passed the exam
12) If hadn't been busy yesterday,I would have visited you
13) what would happen if you didn't go to work tomorrow
14) If I had gone your paty last night,I would have been very tired
15) you wouldn't have been angry if you had known the reason
16) we'll send for the doctor if he feels worse
17) unless they turn the radio off ,I will go somewhere else
18) unless it were a nice day,we won't go out
19) the grass would look better if you took care of it
20) If you leave the gate open, people would get in.