Meaning & use
once a conjunction
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Meaning
conjunction
used to say that as soon as one thing happens, another thing happens or is true.
Grammar: Joins two clauses; the clause after 'once' gives the first event: Once you finish, we can leave.
Patterns
- once + clause, + clause
- once + subject + verb
Once you see the sign, turn left.
Once she had spoken, everyone relaxed.
Once the rain stops, we'll go out.
Common combinations
- once you know
- Once you know the rules, the game is easy.
- once again
- Once again, he forgot his keys.
- once and for all
- Let's settle this once and for all.
Synonyms and how they differ
- as soon as
- Very similar, but 'as soon as' can sound more immediate; 'once' often suggests a condition that must be met first.
- when
- Broader; 'when' can mean every time or at the time, while 'once' means after the action is completed.
Word family
- once adverb
- One time: I met her once.
Commonly confused: once a conjunction or one?
once a conjunction vs one
Do not confuse 'once' with 'one'; 'once' means one time or as soon as.
Practice
Choose the correct sentence.
Choose one answer.
'Once' as a conjunction is followed by a present-tense clause for future meaning: Once you arrive, call me. The other options use future 'will', a noun phrase, or no subject, which do not fit this pattern.
Make it your own
Write a sentence using “once a conjunction”, then check it and compare it with the examples above.