I went to Australia on vacation (Ame. Englis)/on holidays (Brit. English).
On my vacation I went (or traveled) to the United States.1a)
Could be "I have been once"...but you use "have been" to mean "life-long events" where in opposition to the word "never". That is, answering the question "have you ever been to...? " and in answer to the question "where have you been?" (now referring to a recent past
Notice that you can say I have been to the United States twice/many times etc on vacation. 2)
Other possibility to use "gone
" (rather than been) is if you mean someone have gone somewhere and has not returned yet.
(which can not be the case when referring to yourself
.) Gone could also have a more definite
sense to it.http://esl.about.com/od/grammarintermed ... m_gone.htm