Cool MateCertain vs You are sure of this
When to use each in English, with meaning, register, and examples.
Certain
Top 1,000 (very common)A2adjective
You are sure of this
Top 5,000 (fairly common)
Most common: Certain
| Certain | You are sure of this | |
|---|---|---|
| Pronunciation | 🇬🇧 /["/ˈsɜːtn/"]/🇺🇸 /["/ˈsɜːrtn/"]/ | 🇬🇧 //jʊ ɑːr ʃʊə ɒv ðɪs//🇺🇸 //ju ɑr ʃʊr ʌv ðɪs// |
| Meaning | sure, without any doubt | You believe this with confidence. |
| Example | I am certain that I locked the door before leaving. | You are sure of this because you have seen the evidence. |
| Register | Neutral | Neutral |
| How common | Top 1,000 (very common) | Top 5,000 (fairly 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 | be sure of something, make sure of this, not sure of this, feel sure of this, are you sure of this |
| 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). | Confusing with 'You are sure about this'., Using 'of' instead of 'about' incorrectly., Saying 'You sure of this?' instead of 'Are you sure of this?' |
| 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. | Used in conversations where someone seeks confirmation. Suitable for both written and spoken contexts. Can be informal in casual discussions. |
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Frequently asked questions: Certain vs You are sure of this
What's the difference between Certain and You are sure of this?
Certain: sure, without any doubt You are sure of this: You believe this with confidence.
Which is more common: Certain and You are sure of this?
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. You are sure of this: You are sure of this because you have seen the evidence.
Can I use Certain and You are sure of this interchangeably?
Not always. Certain and You are sure of this 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.