可以不 and 不可以 是一样的意思吗? 我们该怎么理解和使用这两个词语？
NO 不一样!
可以不……的意思是：allow sb not do sth... which means permission or a certain ability.
in the sentence will be 可以不+v
Example
①我不是非得要你说，你可以不说。
I don't have to ask you to say it, you can leave it alone.
②这把锁太旧了，任何人都可以不用钥匙，一扭就开。
This lock is too old, anyone can open it with one twist without the key.
不可以……的意思是不能、不行、不允许做某事。means that you cannot do sth, or are not allowed to do something.
in the sentence weil be 不可以+v
Example
③考试的时候不可以随便说话。
You cannot talk casually during the exam.
④A：我可以拿走这张图吗？—— Can I take this picture?
B：不可以，我们还要用。—— No you can't, we have to use it.
来源：vipchinese网
