1. If he wants to get good marks , he must study harder. ->Unless. 2.If you want to go to university , you should study very well. ->Unless. 3.If you dont practise speaking English every day , you cant improve your English. ->Unless. 4.If you dont give back my money you took , I will call the police. ->Unless.. 5.If you dont keep silence , you must go out. ->Unless 6.If she is free , she can go to Vung Tau with me. ->Unless. 7.If you arent careful , you will punish. ->Unless. 8.If he phones her immediately/ he will get some information. ->Unless.. 9.If you dont make any mistakes , you wont get bad marks. ->Unless 10.If you show me your identify card, you can withdraw some money. -> Unless 11.If you speak slowly , he will be able to understand you. ->Unless.. 12.If he doesnt take any exercise, he will be fat. ->Unless.. 13.If you leave now , you wont miss the train . -> Unless. 17.If you dont wear your coat , you will cold -> Unless