on every weekday moring 这样的短语正确么 介词on 是否应该去掉?为什么?

on every weekday moring 这样的短语正确么 介词on 是否应该去掉?为什么? on weekday、on weekday的意思 是on the moring of weekday 还是 in the of weekday? 英语介词in、on等,怎么用?如：in the moring还是on the moring? in at on 介词短语 it is on a cold moring为什么用on on weekday 和on weekdays 一样么?还有on weekend 和on weekends 一样么 on halloween是否正确 是on weekdays还是on weekday? we are busy on weekday的同义句 every week前的介词是哪个,at还是on 英语中介词on的所有用法和短语