《Tomorrow》的詞曲由Avril Lavigne和Chad Kroeger合作完成，歌詞由Lavigne獨力完成。歌詞主要描述了主人公內心的不安與疑慮，希望過去的昨日會隨著時間逝去，現在的心情需要休息，放輕鬆。歌詞如下：
Tomorrow, tomorrow
Won't bring me down, oh no
(Another) tuesday, tuesday
Gonna start again
I'm not gonna let it get me down
I'm not gonna let it bring me down
Oh no
Tomorrow, I'll be alright
Just got to face the pain
Gonna make it through another day
Gonna make it through another day
I'm not gonna let it get me down
Gonna get myself back up again
I'm not gonna let you bring me down
Oh no
The nights are getting longer
The days are getting shorter now
Gonna face the world with all its shadows now
(shadows) now
Gonna make it through another day
Gonna make it through another day
Gonna make it through tomorrow
(Chorus)
Tomorrow, tomorrow
Won't bring me down, oh no
(Another) tuesday, tuesday
Gonna start again
I'm not gonna let it get me down
Gonna get myself back up again
I'm not gonna let you bring me down
Oh no
Oh no oh no oh no oh no oh no oh no oh no oh no oh no oh no oh no oh no oh no oh no oh no oh no oh no oh no
(Yeah yeah yeah)
(Gonna make it through another day)
(Gonna make it through another day)
(Gonna make it through tomorrow)