1 i will come to bejing this summer vacation我今年暑假要去北京
问题描述：
1 i will come to bejing this summer vacation我今年暑假要去北京
2 i will come to bejing in this summer vacation
3 i will come to bejing in summer vacation 今天老师说只能用第一句~不能加in~为什么?2 .3句都不行
答
this summer vacation
这个暑假
和this morning/afternoon一样 不用加介词
I went to the market this morning.