four weeks ago

USAGE SUMMARY

The phrase "four weeks ago" is correct and usable in written English. You can use it to refer to a specific time in the past, indicating that something happened four weeks prior to the current date. Example: "I started my new job four weeks ago." Alternative expressions include "a month ago" and "four weeks back."

✓ Grammatically correct

News & Media

Formal & Business

Science

Human-verified examples from authoritative sources

Exact Expressions

51 human-written examples

The generally bearish mood of four weeks ago has flipped.

Independent

Four weeks ago, Yowie hired a digital marketing expert.

The New York Times

"What did you eat four weeks ago?" Dr. Tauxe said.

The New York Times - Science

"You're better off now than you were four weeks ago".

The New York Times

We're back where we were four weeks ago".

The New York Times - Sports

"These were faits accomplis four weeks ago," he said.

The New York Times

Human-verified similar examples from authoritative sources

Similar Expressions

9 human-written examples

A part-time inspector was appointed four weeks ago.

The New York Times

He says "they" burgled him four weeks ago.

The Guardian

I think of what happened almost four weeks ago now.

The Guardian - Music

But I was in Caracas four weeks ago.

The Guardian - Arts

They have 400 active users after launching four weeks ago.

TechCrunch

Expert writing Tips

Best practice

In formal reporting, pair this phrase with a simple past tense verb to clearly delineate a completed action in the past.

Common error

Avoid using the preposition since with the word ago (e.g. "since four weeks ago"). Instead, use "for the past four weeks" if describing a duration that continues into the present, or simply use the phrase without since to mark a specific point.

Linguistic Context

The phrase "four weeks ago" functions as an adverbial of time. It is used to indicate a point in time that occurred exactly four weeks before the current moment or a specific reference point. According to Ludwig, this structure follows the standard English pattern of [duration] + [ago] to indicate past time.

Expression frequency: Very common

Frequent in

News & Media

85%

Formal & Business

10%

Science

5%

Less common in

Wiki

1%

Social Media

1%

Reference

1%

Ludwig's WRAP-UP

The phrase "four weeks ago" is a robust and versatile temporal marker in the English language. Ludwig AI highlights its frequent appearance in top-tier publications like The New York Times and The Guardian, where it serves to provide a specific chronological context. Unlike the more general "a month ago", this phrase emphasizes a 28-day span, making it ideal for business metrics, medical reporting and narrative storytelling. It is grammatically sound, widely accepted and serves as a neutral bridge between formal and informal communication. When using it, remember to pair it with the simple past tense and avoid redundant prepositions to maintain a clean, professional writing style.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

a month ago

Uses a broader calendar unit rather than specific weekly counts.

about four weeks ago

Softens the precision of the weekly count.

four weeks back

Slightly more informal variant using back instead of ago.

roughly a month ago

Adds a hedging term to indicate the time is an estimate.

one month prior

A more formal construction often used in technical or academic writing.

four weeks previously

Shifted perspective usually used when describing a sequence in the past.

approximately 28 days ago

Provides a precise day count, highlighting the exactness of the duration.

the previous month

Refers to the last calendar month rather than 28 days from now.

last month

The most common conversational alternative to refer to the prior month.

four weeks before

Typically requires a following noun or a relative reference point.

FAQs

How to use "four weeks ago" in a sentence?

You can use it to pinpoint an event in the past, such as "I started this project "four weeks ago"." or "The company launched its new app "four weeks ago"."

What is the difference between "four weeks ago" and "a month ago"?

While often used interchangeably, "four weeks ago" implies a precise duration of exactly 28 days, whereas "a month ago" can refer to the same date in the previous month, which might be 30 or 31 days.

Can I say "four weeks back" instead of "four weeks ago"?

Yes, "four weeks back" is a valid alternative, though it is slightly more colloquial than the standard "four weeks ago".

Is it correct to say "since four weeks ago"?

It is generally considered incorrect or awkward. It is better to use "for the last four weeks" or "since last month".