He is more serious about his studies now.

他现在对学习更认真了。

同一单元的其他句子

• My sister is more outgoing than me.我妹妹比我更外向。
• Who is more hard-working, Tom or Jerry?谁更勤奋，汤姆还是杰瑞？
• I am not as funny as my best friend.我不如我最好的朋友有趣。
• She sings more loudly than her classmates.她唱歌比她的同学更大声。
• Be more careful when you cross the street.过马路时要更加小心。