on a sunday这是怎么个用法?是不是每逢周末的意思 固定搭配么?

on a sunday这是怎么个用法?是不是每逢周末的意思 固定搭配么? 是in a sunny Sunday还是 on a sunny Sunday?应该说in a sunny Sunday还是 on a sunny Sunday? 是in Sunday还是on sunday 是 in sunday 还是 at sunday 还是 on sunday? ---------a Sunday morning 是用in还是on? 是on Sunday evening还是in Sunday evening 是on the sunday afternoon 还是in the sunday afternoon 是 in Sunday afternoon 还是 on Sunday afternoon 是on Sunday morning还是in Sunday morning? 英语里表时间的介词用法问题 例侞：在星期天的早上 是In sunday moring 还是on 这一类问题 （详细点）谢谢 选择并说明为什么：He _____ his grandparents _____ Sunday morning .A.visits ,on B.visited,/英语中,“在周日早晨”是Sunday morning 还是on Sunday morning She 这里是?on sunday morning 是on sunday evening 还是什么? What did you do 后是加on sunday还是sunday?是加on sunday morning 还是加sunday morning?是加in the morning还是加morning?为什么我看过两种都有?到底怎么用? On A Sunday 歌词 on the following Sunday是这个星期天还是下个星期天? have spend on是个短语么?什么用法?- My sister often flies a kite on Sunday?怎么改为特殊疑问句 on Sunday 加横线