Once a year is correct.
Neither "I gone there once" nor "I been there once" are correct. One would say "I have been there" or "I've been there" OR "I have gone there" or "I've gone there". As for "I was there once" and "I went there once", they are both acceptable. The word "once" in all of these statements is not necessary unless the author is specifically stating that they were at said location only once (not twice, not thrice).
Well "Once" means one time. For example: "once upon a time..."
If you're asking one person, "Your name is?" If you're asking several people at once, "Your names are?"
The English word once has one syllable. The Spanish word once (English for eleven) has two syllables.
use it as present simple such as I clean my room once a week
The second one a once-in-a-lifetime experience
Neither "I gone there once" nor "I been there once" are correct. One would say "I have been there" or "I've been there" OR "I have gone there" or "I've gone there". As for "I was there once" and "I went there once", they are both acceptable. The word "once" in all of these statements is not necessary unless the author is specifically stating that they were at said location only once (not twice, not thrice).
Greg once lived out there in the desert.
Platypuses lay one to three eggs once a year.
annual
once around the sun is one revolution, which is one year.
The Earth rotates on its axis (an imaginary line going through the centre of the earth from the North pole to the South pole) once every twenty-four hours, and it orbits the Sun once every year.
ONE! you can only be born once a year!
The Earth takes one year to go around the Sun.
Both onetime means occurring only once, or formerly, depending on usage as adjective or adverb. one time; as to have a turn only once.
One, but they will mate once a year.
The correct riddle is:"What occurs once in a year, twice in every month, four times in every week and six times in each and every weekend?"The answer is the letter 'E'a yEarEvEry monthEvEry wEEkEach and EvEry wEEkEnd