Use the present perfect to talk about life experiences — things you have or have not done at some point in your life. The exact time is not important.
Use ever in questions to mean 'at any time in your life.'
Use never in negatives to mean 'not at any time.'
| Subject | Auxiliary | Past Participle |
|---|---|---|
| I / you / we / they | have (ever / never) | visited, seen, eaten… |
| he / she / it | has (ever / never) | visited, seen, eaten… |
| questions | Have / Has + subject + ever | past participle? |