一.如果是介词后面接动词,通常用ing。如:1.We wear uniforms for working. 2.You should take off your shoes when entering someone's home in Japan. 这样的介词通常有:for in on at 二.但不定式接动词时,用原型。如:People wear clothes to keep them warm. 有一些特殊短语中,也会接ing,但这种情况较少,如:look foward to doing 三.介词后还可以接名词。如:I learn math with interest. 这样的介词通常有:for in on at with 除此之外还有一些,需要具体情况具体分析。 希望能对你有帮助,祝你学业进步O(∩_∩)O哈哈~