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High quality example sentences with “once before” in context from reliable sources - Ludwig is the linguistic search engine that helps you to write better in English.
1 one time; on one occasion or in one case. 2 at some past time; formerly. I could speak French once. 3 by one step or degree (of relationship) a cousin once removed. 4 in conditional clauses, negatives, etc. ever; at all. if you once forget it. 5 multiplied by one. 6 ♦ once and away.
We use before as a subordinating conjunction. We commonly use before with the past simple tense. It suggests that the second event happened soon after the first one. The before clause, which indicates the second action, can be at the end or at the beginning of the sentence: …
We use once as a conjunction meaning ‘as soon as’ or ‘after’: Once I’ve picked Megan up, I’ll call you. Source: https://dictionary.cambridge.org/grammar/british-grammar/adverbs-of-time-and-frequency/once
We use once as an adverb to mean ‘one single time’: I’ve only met Jane’s husband once. (one time) We say once a + singular time expression and once every + plural time expression to talk about how often something happens: They go for dinner together once a month. (one time per month) Not: They go for dinner once the month.
The main difference between 'once' and 'after' is that 'once' expresses a sense of urgency while 'after' simply points out what follows an action or event.
/wʌns/ Idioms. on one occasion only; one time. I've only been there once. He cleans his car once a week. She only sees her parents once every six months. For optimum effect, these drops are used once daily. I had met Lou once before. Last year the region received rain only once. (informal) He only did it the once.
