A classmate studies half-heartedly. You can use (verse)

1; Young people who don't work hard are pathetic. -Long songs, ancient poems of Han Yuefu.

2; Diligence is good at diligence, but not good at playing. -Han Yu's "Learning Solution"

3; Time is money. -"Augmented Sage"

4; Just as celestial bodies maintain vitality through movement, a gentleman should constantly pursue self-improvement. -"Zhou Xiang"

5; Not strong is not wise. -"Mozi cultivate one's morality"

6; Green is taken from blue, and green is blue; Ice and water are cooler than water. -"Xunzi, Encourage Learning"

7; Be ambitious. -Zhuge Liang's Ten Commandments of Exogenous Factors

8; Wan Li is still a close neighbor. -Cao Zhi's "Give a White Horse to Wang Biao"

9; Where there is a will, there is a way. -Biography of Geng in the Later Han Dynasty

10; Teenagers only know how to play, but don't know how to study hard. When they are old, they regret why they didn't know how to study hard when they were young.