I decided to go to the movies when i finished my homework at home 。 不能用while的吧,while是修饰延续性动词的,完成作业是一瞬间的事,不可能一直持续“完成”这个动作,所以不能用延续性动词修饰。 (ps:when可以修饰短暂性动词也可以修饰延续性动词,一般延续性动词用while 短暂性用when。while一般加过去进行时,例如:he called her while she was doing her homework。做作业是一直在做 所以应该用延续性动词修饰。 )