你能写繁体字吗？

Nǐ néng xiě fántǐzì ma?

Can you write traditional Chinese characters?

我最近在学繁体字。

Wǒ zuìjìn zài xué fántǐzì.

I've been learning traditional Chinese characters lately.

我不懂繁体字。

Wǒ bù dǒng fántǐzì.

I don't understand traditional Chinese characters.