I have ever been to Japan, but I have never been to Korea.

[Alice Chu]

Are the sentences below incorrect?
1. I have ever been to Japan, but I have never been to Korea.
2. Yes, I have ever been to Korea.

 

[slevlife]

Yes, both are incorrect and they sound extremely unnatural. Use these:

1. I've been to Japan, but I've never been to Korea.
2. Yes, I've been to Korea.

 

[teechar]

Yes, they are both wrong. "Ever" is usually used in the question form of a sentence. However, it is possible to use "hardly ever" or "only ever".
For example:
I don't really like traveling. I've only ever been to Germany, and that was when I was a child.
She's hardly ever been late with the rent. She's a model tenant.