1. to+动词原型可作目的状语,意为“为了”2.词组in order to do sth,后跟动词原型 in order that,后跟从句3.词组so that,后跟从句如:He got up early to .catch the first bus.= He got up early in order to catch the first bus.= He got up early in order that he could catch the first bus.=He got up early so that he could catch the first bus.他起得很早是为了赶上早班车。