Hi @Jeremypu2019,
You’re right. And these action verbs are those that we can find that “it already happened”.
Hi @Susanna330666400 ,
You’re right. Sometimes even it’s grammatically wrong, people still use it. So if you want to check whether people say so or not, you can just type it in Baidu like I did. I typed 对没对, and found no one use it.
Hi @jasonporta,
Of course you’re qualified to do it. And you’re sentences are correct. But just notice that 懂不懂 sometimes makes people feel uncomfortable if the intonation is aggressive, so to avoid that, we would prefer to say 你到了醫院就左轉,知道了嗎?or 知不知道.
Betty