Cool MateAgo vs Before vs Previously
When to use each in English, with meaning, register, and examples.
Ago
Top 1,000 (very common)A1adverb
Before
Top 1,000 (very common)A1preposition
Previously
Top 2,000 (common)B1adverb
| Ago | Before | Previously | |
|---|---|---|---|
| Pronunciation | 🇬🇧 /["/əˈɡəʊ/"]/🇺🇸 /["/əˈɡəʊ/"]/ | 🇬🇧 /["/bɪˈfɔː(r)/"]/🇺🇸 /["/bɪˈfɔːr/"]/ | 🇬🇧 /["/ˈpriːviəsli/"]/🇺🇸 /["/ˈpriːviəsli/"]/ |
| Meaning | in the past; before now | At an earlier time than something else. | Before now; earlier. |
| Example | two weeks/months/years ago | I always wash my hands before dinner. | The building had previously been used as a hotel. |
| Register | Neutral | Neutral | Neutral |
| How common | Top 1,000 (very common) | Top 1,000 (very common) | Top 2,000 (common) |
| CEFR level | A1 | A1 | B1 |
| Part of speech | adverb | preposition | adverb |
| Collocations | two years ago, just ago, long ago | before dinner, before school, before sunrise | previously mentioned, previously discussed, previously stated, previously introduced, previously reported |
| Antonyms | future | after, following | subsequently, afterwards |
| Common mistakes | Incorrectly using 'ago' with future events., Confusing 'ago' with 'since' when discussing past time., Omitting the time expression, e.g., saying 'I saw him ago.' | Confusing 'before' with 'after'., Using 'before' to refer to an event that can only happen afterwards., Omitting the necessary clause or event after 'before'. | Using 'previous' instead of 'previously' in a sentence., Confusing 'previously' with 'currently' which means now., Misplacing 'previously' in a sentence and changing the meaning. |
| Usage notes | Use 'ago' to refer to a specific time in the past. It's typically used in informal and neutral contexts, but avoid using it in very formal writing or speeches. | Used to indicate a time prior to an event or action. Common in both spoken and written language. Avoid using it in extremely formal writing; in that context, consider 'prior to'. | Use 'previously' to connect past events with the present. It's suitable for both spoken and written contexts but may sound too formal in casual conversations. |
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Frequently asked questions: Ago vs Before vs Previously
What's the difference between Ago, Before, and Previously?
Ago: in the past; before now Before: At an earlier time than something else. Previously: Before now; earlier.
Which is more advanced: Ago, Before, and Previously?
Previously is the highest level, at B1, on the CEFR scale.
Are Ago, Before, and Previously the same CEFR level?
Ago: A1, Before: A1, Previously: B1 on the CEFR scale.
What part of speech are Ago, Before, and Previously?
Ago: adverb, Before: preposition, Previously: adverb.
Can you show an example of each?
Ago: two weeks/months/years ago Before: I always wash my hands before dinner. Previously: The building had previously been used as a hotel.
Can I use Ago, Before, and Previously interchangeably?
Not always. Ago, Before, and Previously 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.