《What are you going to do at the weekends?》Making plans PPT课件3
《What are you going to do at the weekends?》Making plans PPT课件3第3页

on at in

on 表示具体的某一天 在星期几、节日或具体某一天的上午、下午或晚上 e.g. on Tuesday on Friday evening on Children's Day on a cold winter morning