when did this happen

USAGE SUMMARY

The part of the sentence "when did this happen" is correct and usable in written English.
You can use this phrase when you want to ask someone about the timeline of an event or when something occurred. For example: "I heard about the accident, but when did this happen?".

✓ Grammatically correct

News & Media

Academia

Science

Human-verified examples from authoritative sources

Exact Expressions

17 human-written examples

WHEN did this happen?

The New York Times

When did this happen?

The New York Times - Magazine

Sorry, when did this happen?

The Guardian - Opinion

When did this happen, what was the diagnosis and treatment?

The Guardian - Books

When did this happen, exactly, and by whom, because I think I missed that.

The New Yorker

"When did this happen to you?" asks one, with genuine concern.

The Guardian - Travel

Human-verified similar examples from authoritative sources

Similar Expressions

43 human-written examples

When does this happen?

Yale University

"When exactly did this happen?" Lou asks.

The New Yorker

When did this accomplishment happen?

University of Chicago

"I mean, you could also say, when did this all happen?

Vice

When did this start happening?

Vice

Expert writing Tips

Best practice

Use "when did this happen" to inquire about the timing of a specific event you are aware of but need clarification on the exact time it occurred. It's suitable for both formal and informal settings.

Common error

Avoid using "when did this happen" without a clear reference to the event in question. Ensure the context makes it obvious what "this" refers to, or specify the event to prevent confusion.

Linguistic Context

The phrase "when did this happen" functions as an interrogative clause, seeking information about the timing of an event. According to Ludwig, this phrase is grammatically correct and suitable for asking about the timeline of an event.

Expression frequency: Common

Frequent in

News & Media

36%

Academia

24%

Science

21%

Less common in

Wiki

9%

Formal & Business

6%

Reference

4%

Ludwig's WRAP-UP

The phrase "when did this happen" is a common and grammatically correct way to inquire about the timing of an event. As Ludwig AI indicates, it's suitable for various contexts, although more formal alternatives exist for professional settings. The phrase functions as an interrogative clause, aiming to establish a temporal context. It is frequently used in news and media, academic, and scientific sources. To prevent confusion, it's best to ensure that the reference to "this" is clear. Related phrases include "when exactly did it occur" and "at what point did this take place", offering similar inquiries about the timing of an event.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

When was this event?

A shorter, more direct way of asking the same question.

When exactly did it occur?

Adds emphasis on the precise timing of the event.

When was it that this happened?

Emphasizes the inquiry about the timing of the event.

At what point did this take place?

More formal way of asking about the timing.

Can you tell me when this occurred?

Adds a polite request to the inquiry.

When did it transpire?

Uses a more formal and less common verb.

What was the date of this event?

Specifies the need for a date.

On what day did this occur?

Similar to asking for the date, but specifies 'day'.

How long ago did this happen?

Asks about the duration since the event.

What year did this happen?

Focuses specifically on the year of the event.

FAQs

How can I rephrase "when did this happen" to sound more formal?

For a more formal tone, you could use phrases like "At what point did this take place?" or "When exactly did this occur?" These alternatives are suitable for professional or academic contexts.

What's a more casual way to ask "when did this happen"?

Informally, you can ask "When was this?" or "How long ago was this?" These options are appropriate for conversations with friends or family.

Is it correct to say "when did this happened" instead of "when did this happen"?

No, "when did this happened" is grammatically incorrect. The correct form is "when did this happen". The auxiliary verb 'did' already indicates past tense, so the main verb should be in its base form.

What can I say instead of "when did this happen" to focus on the duration since the event?

If you want to emphasize the time elapsed, use "how long ago" did this happen? This shifts the focus from the specific time to the amount of time that has passed.