3 sentences for 老奶奶 (lǎo​nǎi​nai)

1. 我扶着老奶奶过了马路。

   wǒ fú zhe lǎo​nǎi​nai guò le mǎ​lù.

   I helped the old lady across the street.

   Source: Dong Chinese Dictionary

2. 这位老奶奶迷路了，我们帮帮她吧。

   zhè wèi lǎo​nǎi​nai mí​lù le, wǒ​men bāng bāng tā ba.

   This grandmother is lost; let's help her.

   Source: Dong Chinese Dictionary

3. 我的老奶奶去年刚过了一百岁生日。

   wǒ de lǎo​nǎi​nai qù​nián gāng guò le yī​bǎi suì shēng​rì.

   My great-grandmother just celebrated her hundredth birthday last year.

   Source: Dong Chinese Dictionary