1) if we don t reduce the amount of fresh water we use,it is certain to run out(will) we need to use less fresh water or it 2)next month, there s a chance l‘ll be going on a trip to sweden (might) next month ,l on a trip to sweden. 3) l have a lot to do today,but l plan to finish by six o‘clock(will) l have a lot to do today,but by six o‘clock l finished 4)l know things will turn out all right(is) everything be all right 5)jasj will be back by the end of the week.(returned) jack by the end of the week