on school night为什么不加a如上,请详解on school night 为什么不像on a beautiful da_英语解答

on school night为什么不加a
如上,请详解
on school night 为什么不像on a beautiful day一样加a,尽快呀,(或者是on school nights)
另外补充：
1.on Sunday和on Sundays 分别在什么情况下用,详解区别,如例句：Be at home on Sunday,为什么不是Sundays
2.Be at home at 8:00 on Sunday,这句可否改成Be at home at(还是用on呢,不清楚）8:00 of Sunday

人气：482 ℃　时间：2020-04-01 11:56:18

解答

school night:any night of the week that precedes a day of school （所有第二天要上课的夜晚）,如：Because I can't go out on school night.可以翻译成：因为只要第二天有课,我晚上就不能外出.school nights:上...