Cool MateCertain vs Sure about that
When to use each in English, with meaning, register, and examples.
Certain
Top 1,000 (very common)A2adjective
Sure about that
Top 3,000 (common)
Most common: Certain
| Certain | Sure about that | |
|---|---|---|
| Pronunciation | 🇬🇧 /["/ˈsɜːtn/"]/🇺🇸 /["/ˈsɜːrtn/"]/ | 🇬🇧 //ʃʊə əˈbaʊt ðæt//🇺🇸 //ʃʊr əˈbaʊt ðæt// |
| Meaning | sure, without any doubt | Confident in something or having no doubt. |
| Example | I am certain that I locked the door before leaving. | I am sure about that decision we made last week. |
| Register | Neutral | Neutral |
| How common | Top 1,000 (very common) | Top 3,000 (common) |
| CEFR level | A2 | - |
| Part of speech | adjective | |
| Collocations | be, feel, look, very, absolutely, quite, about, of, can’t say for certain, not know for certain, be, feel, look, very, absolutely, quite, about, of, can’t say for certain, not know for certain | sure about something, not sure about that, be sure about it |
| Antonyms | uncertain, doubtful, indefinite | - |
| Common mistakes | Confused with 'sure' in different contexts., Using 'certain' without clarifying what is certain about., Incorrectly using 'certain' to describe someone as a person (should be used for objects or ideas). | Using with a negative without proper context., Confusing with 'sure of' which can imply a different nuance., Incorrect intonation may change the meaning. |
| Usage notes | Use 'certain' when you want to express confidence in something. It's appropriate in both spoken and written English, but avoid it in very formal contexts where 'specific' or 'determined' may be better. | Use in conversations to express confidence or assurance. It is appropriate in both formal and informal settings. Avoid using it when unsure. |
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Frequently asked questions: Certain vs Sure about that
What's the difference between Certain and Sure about that?
Certain: sure, without any doubt Sure about that: Confident in something or having no doubt.
Which is more common: Certain and Sure about that?
Certain is the most common in everyday English.
Can you show an example of each?
Certain: I am certain that I locked the door before leaving. Sure about that: I am sure about that decision we made last week.
Can I use Certain and Sure about that interchangeably?
Not always. Certain and Sure about that 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.