{{Grammar Box}} Chinese learners often have to express that they don't understand something, especially in the beginning when they start learning. One of the ways to express that is to use the 不懂 (bù dǒng) verb complement. == Structure == Yes, 不懂 (bù dǒng) by itself simply means "not understand," and you can use it this way. But you'll find that more often, it follows a verb. When used this way, it is a [[complement]]. The [[potential complement]] 不懂 (bù dǒng) is used to talk about things that can't be understood. Note that this is about ''potential'': the subject doesn't have the ''ability'' to understand.