224.四个“日子”。the day before yesterday，yesterday，tomorrow，the day after tomorrow
（1）the day before yesterday：前天。如：
Today I knew what he did the day before yesterday.
今天我才知道他前天做了什么。
（2）yesterday：昨天。如：
I visited my grandparents yesterday.
我昨天看望了我的外公外婆。
（3）tomorrow：明天。如：(https://www.daowen.com)
Where will you go tomorrow?
你明天去哪里？
（4）the day after tomorrow：后天。如：
It is said he will come the day after tomorrow.
据说他后天会来。