认真

wǒ shì shuō zhe wán r de tā jiù rèn zhēn le

我是说着玩儿的，他就认真了。

I was only joking, but he took it to heart.

bù bì rèn zhēn

不必认真。

Don't take it to heart.

zhè shì wǒ kě jiù rèn zhēn le

这事我可就认真了。

I'm serious about it.

wǒ men shì zài rèn zhēn de bǐ sài

我们是在认真地比赛。

We're playing the game for real.

tā zài rèn zhēn sī kǎo wèn tí

他在认真思考问题。

He is pondering deeply.

xué shēng men zài rèn zhēn xué xí

学生们在认真学习。

Students are studying hard.

rèn zhēn jiě jué wèn tí

认真解决问题

earnestly solve a problem