This is the 1607th most frequent Chinese word.
明天
"Tomorrow."
In this sentence, '明天' is used to specify the time for the action '要去图书馆', indicating the day following today.
我明天要去图书馆。
I will go to the library tomorrow.
Here, '明天' is used as the subject of the sentence to denote the day following today as a temporal reference.
明天是我的生日。
Tomorrow is my birthday.
In this context, '明天' is applied as an adjective to describe '会议', indicating the event occurring on the day following today.