Would help to have the model and type...but typically if the tub is not agitating the coupling between the motor and the tub is worn out or broken. However, if it is spinning properly, it probably indicates a problem with the transmission. Really need to know what type of washer it is to help pin down the problem. Any "burnt" smells coming from the washer? Give a little more information and maybe we can figure it out. Top load...side load, make and model preferred. You can locate that information on a plate usually attached inside the door on most models.