HAVE YOU EVER?

Have you ever...?

Ever means from the time you were born until now. Except for rare exceptions, it can only be used in questions and to answers with a no.It is used with have or had + a past participle.
Example:

Have you ever eaten a frog?
Has she ever gone to Australia?

When you answer the question, a yes answer will use have/has + past participle.

Have you ever seen a whale?

Answer:

Yes, I have seen a whale. or Yes, I have.

If you answer the question with a no, you will need to use

haven't /hasn't + ever + past participle or
have /has + never + past participle
(both of these have the same meaning)

Example:

Have you ever seen a whale?

Answer:

No, I haven't ever seen a whale. or 
No, I've never seen a whale. or 
No, I haven't.