i have to stay at home on school nights为什么用on呢?

i have to stay at home on school nights为什么用on呢? For e___,I have to stay at home on schooi nights.(在空格内填一个单词） Who has to stay at home on school nights?的回答 I stay at home on Saturdays 为什么星期六加s 连词成句 piano,nights,the,to,practice,have,I,school,on _____ a rainy day,I have to stay at home.a.On b.In d.For d.W 为什么I can't go else somewhere because I have to go home at on 英语翻译Well,I remember all the nights I used to stay at home (h I don't like to _____ on Sunday.I want to stay at home. He goes to school at 7:30 on his bike. 为什么要用on呢? We have to stay at home on such a rainy day反义疑问句 ----Tom People have to stay at home on a windy day.(否定） People ___ _