1.If today...(tobe/not)cold,we would go swimming. 2.If I throw an object away,it...(drop). 3.If Hoang...(tobe/not) to study harder,he would get good marks. 4.If Kim...(tobe/not) lazy,she would't have failed her exam. 5.If they...(go/not) to her birthday qarty tomorrow,they would be very angry.