是in the afternoon 还是at the afternoon?

是on the sunday afternoon 还是in the sunday afternoon 是in the afternoon 还是at the afternoon? 是in night还是at night,是at the afternoon还是in the afternoon 在下午是用in the afternoon还是on the afternoon? 是in the afternoon of April 30th 还是 on the afternoon of April 30th 英语翻译介词是用on the tomorrow afternoon还是in the tomorrow afternoon 是用in the morning/afternoon 还是on the morning/afternoon比如：I have four lessons in the morning.I have two lessons in the afternoon. in the afternoon of Friday还是on Friday afternoon 是 in Sunday afternoon 还是 on Sunday afternoon 请问是in Friday afternoon还是on Friday afternoon? 是on yesterday afternoon 还是in 是On the last Sunday afternoon还是in the last Sunday afternoonRT 英语上是on the day afternoon还是in the day affteroon?整个句子是：He often helps his parents do the housework Saturday afternoon. 我想问下是on monday 还是in monday,是in monday afternoon 还是on monday afternoon 应该是in the afternoon of July 11,还是on the afternoon of July 11? In The Afternoon 歌词 in the afternoon?意思? the afternoon of Monday前应该写in还是on