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. Have you ever gone camping ? No- I haven’t. Have you ever been to United State ? Have you ever been in United State ? Have you ever worn a cowboy hat ? I have ever eaten Chinese food. I have ever seen this person before. Have you ever bought a very expensive item of jewellery? My family has ever grown our own vegetables . She has ever kept a very important secret.