Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
in which years
Grammar usage guide and real-world examplesUSAGE SUMMARY
"in which years" is a correct and usable phrase in written English.
You can use it when you want to express that you are asking what years something occurred or happened. For example: "Can you tell me in which years the TV show was airing?".
✓ Grammatically correct
News & Media
Science
Encyclopedias
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
15 human-written examples
Their climactic confrontation, in which years of bitterness and dashed expectations pour out, is one of the most moving scenes I've seen in a movie this year.
News & Media
But as with jazz, in which years of study are required to reach a level where a performance feels natural and unstudied, Mr. Burns's moments are the product of planning.
News & Media
_I wondered whether you were thinking at all of John Cheever's "The Swimmer"—a story in which years pass as a man is engaged in what seemed at first to be one afternoon's frivolous activity.
News & Media
I wondered whether you were thinking at all of John Cheever's "The Swimmer" — a story in which years pass as a man is engaged in what seemed at first to be one afternoon's frivolous activity.
News & Media
It has a wildly improbable plot in which years of austerity magically produce economic growth; mountains of public debt are paid off by shrinking economies; unaccountable experts know more about other countries than their own elected governments; and everyone lives happily ever after.
News & Media
Chepauk, the stadium now known as MA Chidambaram, was furnace-hot for cricket, with dripping, energy-sapping humidity, the sort of conditions in which years later the Australian Dean Jones was to make a double hundred and end up in intensive care for his pains.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
45 human-written examples
In which year was said grandfather born?
News & Media
Moving right along: in which year was vacancy decontrol enacted? A. 1997.
News & Media
Scary Movies 11 In which year did Boris Karloff make his screen debut as Frankenstein's monster?
News & Media
I couldn't have told you which tracks were on which album and which album was recorded in which year.
News & Media
He was married first in 1964 to Sarah Paine, a marriage dissolved in 1987, in which year he married Caroline Maynard.
News & Media
Expert writing Tips
Best practice
When asking about specific years within a known period, "in which years" provides a clear and formal way to frame your inquiry. For example, "In which years did the company experience the most growth?"
Common error
Avoid using "in which years" when referring to a continuous period without specific annual distinctions. For instance, instead of "in which years the project was ongoing", use "during which time the project was ongoing".
Source & Trust
81%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "in which years" functions as an adjective phrase introducing a relative clause. According to Ludwig, the phrase is correct and usable in written English, typically used to specify a timeframe or period about which more information is being requested or provided. This is confirmed by the available examples.
Frequent in
News & Media
40%
Science
35%
Encyclopedias
15%
Less common in
Wiki
10%
Formal & Business
0%
Social Media
0%
Ludwig's WRAP-UP
In summary, "in which years" is a grammatically correct and usable phrase, as confirmed by Ludwig AI, serving to specify a particular timeframe. While the phrase is considered uncommon, it appears most frequently in News & Media and Science, lending itself to formal contexts. To enhance clarity, avoid its usage when referring to extended durations lacking specific annual distinctions. Alternatives include "during which years" for emphasizing a period of time. Overall, this phrase provides a precise way to frame inquiries about events tied to specific years.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
during which years
Replaces 'in which' with 'during which', emphasizing the time period.
in what years
More direct phrasing replacing 'which' with 'what'.
during those years
Specifies a period already mentioned, replacing the relative pronoun.
in those years when
Adds a conjunction and rephrases to include a temporal context.
over the years when
Indicates a longer time span, adding emphasis on the duration.
throughout the years that
Similar to 'over the years,' stressing the duration of the period.
which years saw
Alters the structure to highlight what occurred during those years.
what years did
Direct question format, replacing the relative clause structure.
the years that
Simplifies the phrasing to a more basic relative clause.
during the period
Uses a general term for a time frame, less specific than 'years'.
FAQs
How can I use "in which years" in a sentence?
Use "in which years" to specify the timeframe when asking about events or occurrences. For example: "In which years was the policy in effect?"
What's the difference between "in which years" and "during which years"?
"In which years" is used to ask about specific years, while "during which years" emphasizes a period of time. For example: "In which years did they live there?" vs. "During which years did they live there?"
Is "in which years" formal or informal?
"In which years" is considered a formal phrase. For less formal contexts, you can use alternatives like "what years" or "which years".
Can I use "in which years" to refer to future events?
No, "in which years" is typically used to refer to past or present events, not future ones. For future events, consider phrases like "in what future years" or similar constructions.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
81%
Authority and reliability
4.5/5
Expert rating
Real-world application tested