她来中国以后认识了很多新朋友。

Tā lái Zhōngguó yǐhòu rènshi le hěn duō xīn péngyou.

After she came to China, she met many new friends.

我认识他，他是我同学。

Wǒ rènshi tā, tā shì wǒ tóngxué.

I know him; he is my classmate.

我不认识这个字，你呢？

Wǒ bù rènshi zhè gè zì, nǐ ne?

I don’t know this character, do you?