mothers'day中的点为什么放在s后,在什么情况下放在s后?

mothers'day中的点为什么放在s后,在什么情况下放在s后? Mother’s Day还是Mothers' Day mothers'day和mother's day 到底是Teacher's Day 还是 Teachers' Day那 mother's day 还是 mothers' day？为什么呢？ 为什么母亲节的名词所有格是mother 's day而不是mothers ' day? Mother's Day is a day ________ mothers.为什么填thanking而不是to thank 为什么吗用the mather's day 而不用the mothers' day有什么区别呀? Is it ______today?A.Mother's Day B.Mothers'Day C.Mothers Day D.Mother Day Mother’s day 为什么要把“'”放在s前 为什么英语中的农历（我国）节日大多加the,阳历节日不加?the Spring Festival,the Mid-autumn Festival但是阳历节日都是New Year's Day,Labor Day,Mothers' Day这样不加the的? 母亲节究竟是Mother's Day 还是Mothers' Day Mother's day is a___( day/holiday )for all mothers 母亲节是“Mother’s Day” or “Mothers’ Day”?Why? 母亲节用英语怎么说是Mother's Day还是Mothers' Day.为什么百度新概念2视频中讲的是Mothers' Day?我记忆中不是这样的啊, Happy Mothers' Day! mothers' day是几月几号 Mothers' Day的中文 母亲节可以Mothers'Day?