1) I'll call the police if you don't leave me alone !

--> unless you leave me alone, I'll call the police

3)Without Jack's help , i wouln't have been able to move the table

--> if Jack helped me, I would have been able to move the table

4) Make me some coffee , and i'll give you one of my biscuits

--> if you make me some coffee, I'll give you one of my biscuits

5) If you do the shopping, I'll cook lunch