Cool MateCertainly vs Of course I read it
When to use each in English, with meaning, register, and examples.
Certainly
Top 1,000 (very common)A2adverb
Of course I read it
Top 5,000 (fairly common)
Most common: Certainly
| Certainly | Of course I read it | |
|---|---|---|
| Pronunciation | 🇬🇧 /["/ˈsɜːtnli/"]/🇺🇸 /["/ˈsɜːrtnli/"]/ | 🇬🇧 //əv kɔːs aɪ rɛd ɪt//🇺🇸 //əv kɔrs aɪ rɛd ɪt// |
| Meaning | Definitely; for sure. | It's natural for me to have read it. |
| Example | Without treatment, she will **almost certainly** die. | Of course I read it; it was really interesting! |
| Register | Neutral | Neutral |
| How common | Top 1,000 (very common) | Top 5,000 (fairly common) |
| CEFR level | A2 | - |
| Part of speech | adverb | |
| Collocations | certainly agree, certainly possible, certainly not, certainly true, certainly yes | Of course I agree, Of course I know, Of course you can |
| Antonyms | uncertainly, doubtfully | - |
| Common mistakes | 'Certainly' is often incorrectly used in place of 'certain' in adjectives., Learners might confuse 'certainly' with 'definitely' without noticing the subtle nuance., Some learners use 'certainly' in inappropriate contexts, such as casual greetings. | Using 'of course' in contexts where it's not obvious, making it sound condescending., Misplacing the phrase in sentences, losing its intended emphasis., Translating directly from another language, which may sound awkward. |
| Usage notes | Use 'certainly' when you want to emphasize affirmation or agreement. It is more formal than 'sure' and works well in professional settings, but might feel too strong in casual conversations. | Use this phrase to express a natural understanding or expectation. It's typically informal but can be slightly formal in certain contexts. |
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Frequently asked questions: Certainly vs Of course I read it
What's the difference between Certainly and Of course I read it?
Certainly: Definitely; for sure. Of course I read it: It's natural for me to have read it.
Which is more common: Certainly and Of course I read it?
Certainly is the most common in everyday English.
Can you show an example of each?
Certainly: Without treatment, she will **almost certainly** die. Of course I read it: Of course I read it; it was really interesting!
Can I use Certainly and Of course I read it interchangeably?
Not always. Certainly and Of course I read it 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.