Cool MateCertain vs Some
When to use each in English, with meaning, register, and examples.
Certain
Top 1,000 (very common)A2adjective
Some
Top 1,000 (very common)A1determiner
| Certain | Some | |
|---|---|---|
| Pronunciation | 🇬🇧 /["/ˈsɜːtn/"]/🇺🇸 /["/ˈsɜːrtn/"]/ | 🇬🇧 /["/sʌm/","/səm//sʌm/"]/🇺🇸 /["/sʌm/","/səm//sʌm/"]/ |
| Meaning | sure, without any doubt | a small amount or number of something |
| Example | I am certain that I locked the door before leaving. | Some people enjoy hiking in the mountains. |
| Register | Neutral | Neutral |
| How common | Top 1,000 (very common) | Top 1,000 (very common) |
| CEFR level | A2 | A1 |
| Part of speech | adjective | determiner |
| 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 | some time, some help, some people, some money, some food |
| Antonyms | uncertain, doubtful, indefinite | none |
| 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). | 'Some' cannot be used with plural uncountable nouns. e.g., it's wrong to say 'some rice' when referring to an unspecified quantity., Confusing 'some' with 'any' in negative sentences., Using 'some' in questions when expecting a negative response. |
| 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 'some' when you want to express an indefinite quantity. It is often used in questions where we expect a positive answer. Avoid using it in very formal contexts where precise quantities are required. |
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Frequently asked questions: Certain vs Some
What's the difference between Certain and Some?
Certain: sure, without any doubt Some: a small amount or number of something
Which is more advanced: Certain and Some?
Certain is the highest level, at A2, on the CEFR scale.
Are Certain and Some the same CEFR level?
Certain: A2, Some: A1 on the CEFR scale.
What part of speech are Certain and Some?
Certain: adjective, Some: determiner.
Can you show an example of each?
Certain: I am certain that I locked the door before leaving. Some: Some people enjoy hiking in the mountains.
Can I use Certain and Some interchangeably?
Not always. Certain and Some 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.