Eng: I understand

我明白了

I get, I see, I understand

Realize, Realized, Understand, Understood

我了解

I understand

Consider, Knew, Know, Knowing, Knows, To consider, To know, To understand, Understand, Understanding, Understands, Understood

我懂

I understand, I understood

我聽到了

I heard, I know, I understand, I'm listening

Arrive at, Get to, Got to, Had arrived, Heard, Listened, Reach, Reached