Cool MateI promise vs Vow
When to use each in English, with meaning, register, and examples.
I promise
Beyond 10,000 (less common)
Vow
FormalTop 3,000 (common)C1verb
Most formal: VowMost common: Vow
| I promise | Vow | |
|---|---|---|
| Pronunciation | 🇬🇧 //aɪ ˈprɒmɪs//🇺🇸 //aɪ ˈprɑːmɪs// | 🇬🇧 /["/vaʊ/","/vaʊz/","/vaʊd/","/ˈvaʊɪŋ/"]/🇺🇸 /["/vaʊ/","/vaʊz/","/vaʊd/","/ˈvaʊɪŋ/"]/ |
| Meaning | I will do what I say. | A serious promise to do something. |
| Example | I promise to help you with your project tomorrow. | She vowed never to speak to him again. |
| Register | Neutral | Formal |
| How common | Beyond 10,000 (less common) | Top 3,000 (common) |
| CEFR level | - | C1 |
| Part of speech | verb | |
| Collocations | make a promise, keep a promise, break a promise | quietly, silently, to, vow never to do something, vow revenge, vow revenge against somebody |
| Antonyms | - | break, violate |
| Common mistakes | Confused with 'I promise you' - which adds emphasis., Using it too casually in serious situations. | Confused with 'cow' — they sound similar but have different meanings., Using in informal contexts — 'vow' is too strong for casual promises. |
| Usage notes | Used in informal and formal contexts to assure someone of a future action. Avoid in sarcastic tones. | Use 'vow' when making a serious commitment, often in formal situations like weddings or ceremonies. Avoid in casual conversations. |
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Frequently asked questions: I promise vs Vow
What's the difference between I promise and Vow?
I promise: I will do what I say. Vow: A serious promise to do something.
Which is more formal: I promise and Vow?
Vow is the most formal of these.
Which is more common: I promise and Vow?
Vow is the most common in everyday English.
Can you show an example of each?
I promise: I promise to help you with your project tomorrow. Vow: She vowed never to speak to him again.
Can I use I promise and Vow interchangeably?
Not always. I promise and Vow 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.