(‘ve seen / saw) the Eiffel Tower yet when I went to Paris.
3.
When
(did you go / have you been)?
4.
(Were you / Have you been)
to the US yet?
Present HAVE + V-en with: for + duration or since + starting point
Add: ever (?), yet (?), already, never, not yet, just…
≠ Simple past: specific point in time