後天的英文是：the day after tomorrow。
day就是壹天的意思，after是之後的意思，而tomorrow是明天的意思，而英文壹般用倒裝所以把day放在前面，再用介詞after連接，整體的意思就是：明天的後壹天，這裏提醒壹下時壹般要加上the，即the day after tomorrow。
the day after tomorrow造句
1、We are leavingthe day after tomorrow.
2、I’m freethe day after tomorrow.
3、School beginsthe day after tomorrow.
4、B I'm freethe day after tomorrow.
5、About tomorrow, we will knowthe day after tomorrow.
6、That is scheduled for shipmentthe day after tomorrow.