Once vs Used to call him

When to use each in English, with meaning, register, and examples.

Once

Top 1,000 (very common)A1adverb

Used to call him

Top 2,000 (common)
Most common: Once
 OnceUsed to call him
Pronunciation🇬🇧 /["/wʌns/"]/🇺🇸 /["/wʌns/"]/🇬🇧 //juːst tə kɔː hɪm//🇺🇸 //juːst tə kɔl hɪm//
Meaningone timeSomething you did regularly in the past.
ExampleOnce I finished my homework, I went out to play.I used to call him every Saturday.
RegisterNeutralNeutral
How commonTop 1,000 (very common)Top 2,000 (common)
CEFR levelA1-
Part of speechadverb
Collocationsonce a week, once in a lifetime, once again, once moreused to call, used to go, used to play, used to live, used to visit
Antonymsnever-
Common mistakesConfused with 'once' for 'twice' or other frequencies., Using 'once' with present tense when referring to past events.Confusing 'used to' with 'use to' - only 'used to' is correct., Forgetting to use the base form of the verb after 'used to'., Using 'used to' for current habits.
Usage notesUse 'once' to refer to something happening a single time in the past. It's neutral and often used in storytelling. It wouldn't be appropriate in highly formal writing.Use 'used to' for past habits or states. Suitable in both formal and informal contexts, though more frequent in conversation.

See it in real clips

Used to call him

Frequently asked questions: Once vs Used to call him

What's the difference between Once and Used to call him?

Once: one time Used to call him: Something you did regularly in the past.

Which is more common: Once and Used to call him?

Once is the most common in everyday English.

Can you show an example of each?

Once: Once I finished my homework, I went out to play. Used to call him: I used to call him every Saturday.

Can I use Once and Used to call him interchangeably?

Not always. Once and Used to call him are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

Related comparisons