Difference between 我一句汉语也没听懂 and 我一句汉语也听不懂 （1）刚来中国时，我一句汉语也没听懂。
（2）刚来中国时，我一句汉语也听不懂。

For me:
(1) states the situation that &quot;I cannot understand Chinese sayings&quot; without pointing out any reasons
(2) uses potential complement &quot;听不懂&quot; that means &quot;I cannot understand&quot; because not used to Chinese speaking speed or not know Chinese, etc...
Is what I think correct? If anything goes wrong, please let me know.
我一句汉语也没听懂: I may know some Chinese, but I don't understand what's been said.
我一句汉语也听不懂: I know nothing about Chinese, so I can't understand anything that's been said.