应该用in vacation还是on vacation

应该用in vacation还是on vacation 是in vacation,还是on vacation,还是atvacation? vacation 前用什么介词?是in?还是on? vacation前的介词用on还是in? 请问是in summer vacation还是on summer vacation? a vacation 前用on还是for in the vacation ；go on vacation ；on vacation 区别? 我去年在北京度假用英语怎么说?是in vacation还是on vacaton? 在my summer vacation前面有on还是in. in vacation,on vacation的区别 in vacation和on vacation的差别 for vacation和on vacationMy parents are in Beijing (for) vacation.为什么用for不用on 有关is和are的用法×××'s family ( ) having fun on vacation.（）里应该用is还是用are? 这里的介词用in还是on?this summer vacation 前面的介词用in还是on?主要是限制summer还是vacation?还有像August of this year之类的, go on vacation还是go on a vacation? 请问“我们在山上度假”用英语怎么说?RT,是We are on a vacation in the mountain 还是We are on a vacation in the mountains?用不用复数? 你在中国的哪里度假了用英语怎么说是Where did you go on vacation in China .还是Where did you go in China on vacation.明天要交作文的 应该用on the weekend 还是 in the weekend?