One occurrence can be a single event or one event in each period.
The idea
Once means one time. Place it after the action, or use once a month for one time each month.
Examples
- I visited that island once.
- The bell rang once at noon.
- We eat there once a month.
- Please read the note once.
- She tried skiing once last winter.
- The dog barked once and slept.
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Watch out
Once counts one occurrence; twice counts two.
Try it yourself
Choose the correct answer. The light flashed one time: it flashed ___. (once / twice)
Show answer or example answer
once
once: The light flashed one time.
Choose the correct answer. We swim one time each week: we swim ___. (once a week / once a month)
Show answer or example answer
once a week
once a week: The period is a week, not a month.
Choose the correct answer. Two visits occurred. Did they visit only once? (no / yes)
Show answer or example answer
no
no: Two visits are more than one.
Practice round
Answer questions and rebuild English sentences to practise. Your score is shown.
Choose the correct answer. The light flashed one time: it flashed ___. (once / twice)
Choose the correct answer. We swim one time each week: we swim ___. (once a week / once a month)
Choose the correct answer. Two visits occurred. Did they visit only once? (no / yes)
Tap the words in the right order.
Tap the words in the right order.
Tap the words in the right order.
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Describe one visit and one monthly habit.