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
When suddenly
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase 'When suddenly' is correct and usable in written English.
You can use this phrase when you want to describe an abrupt, unexpected event or action. For example: "We were walking through the park when suddenly the sky became dark."
✓ Grammatically correct
News & Media
Academia
Science
Alternative expressions(8)
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
60 human-written examples
When suddenly it really is the Thing.
News & Media
When, suddenly, the two men exited, one after the other, it was a little shock.
News & Media
When suddenly, it falls to the ground.
News & Media
When suddenly this quaking sound shatters everything below.
News & Media
When suddenly I pulled ahead in some of the major polls, what was the headline?
News & Media
About to consummate passion, when suddenly my leg cramped.
News & Media
The rainforest is still, when suddenly, a branch snaps.
News & Media
Things were going really well, when suddenly something disturbing happened.
News & Media
He protests in confusion when suddenly everyone genuflects before him.
News & Media
I was following a group when suddenly they started running.
News & Media
But when suddenly in June 1975 earthquakes started to happen under the reservoir, authorities became worried.
Expert writing Tips
Best practice
Use "When suddenly" to effectively introduce a turning point or unexpected event in your narrative to captivate the reader.
Common error
Avoid starting multiple consecutive sentences with "When suddenly". This can make your writing sound repetitive and detract from the impact of each individual unexpected event. Vary your sentence structure to maintain reader engagement.
Source & Trust
86%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "When suddenly" functions as an adverbial phrase, modifying the verb in the main clause to indicate the timing and unexpected nature of an action or event. Ludwig's examples showcase it effectively introducing a shift or turning point in a narrative.
Frequent in
News & Media
65%
Academia
18%
Science
17%
Less common in
Formal & Business
0%
Encyclopedias
0%
Wiki
0%
Ludwig's WRAP-UP
In summary, the phrase "When suddenly" is a grammatically sound and frequently used adverbial phrase to introduce an unexpected turn of events. Ludwig AI confirms its proper usage in English writing. It's commonly found in News & Media, Academia and Science contexts, signaling a shift or surprise in a narrative. While effective, avoid overuse for stylistic reasons. Alternatives include phrases like "abruptly" or "unexpectedly" to introduce variety in writing. The expert rating is high due to its correctness, source authority, and consistent usage.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
When unexpectedly
Underscores the surprise element, making it clear the event was unforeseen.
When abruptly
Emphasizes a more forceful and immediate shift, focusing on the abruptness.
When swiftly
Highlights the speed of the change, suggesting a rapid transition.
When immediately
Focuses on the lack of delay, emphasizing that something happens right after.
Out of nowhere
Emphasizes the lack of any prior indication, highlighting the unexpected nature.
As soon as
Indicates a direct temporal connection, emphasizing immediacy more than surprise.
The instant that
Highlights the exact moment something changes, giving more precision.
Upon which
Provides a more formal and literary tone, implying a sequence of events.
Thereupon
Signifies a direct consequence or immediate action following a previous event.
In that moment
Specific to a particular point in time, drawing attention to that instant.
FAQs
How can I use "When suddenly" in a sentence?
Use "When suddenly" to introduce an unexpected event or change in a situation. For example, "I was walking down the street "when suddenly", it started to rain."
What are some alternatives to "When suddenly"?
Some alternatives include "abruptly", "unexpectedly", or "all of a sudden". Each carries a slightly different nuance regarding immediacy and surprise.
Is it grammatically correct to start a sentence with "When suddenly"?
Yes, it is grammatically correct. "When" introduces a dependent clause indicating time, and "suddenly" acts as an adverb modifying the following verb, indicating an abrupt change.
What is the difference between "When suddenly" and "Suddenly"?
"Suddenly" can stand alone to indicate a quick, unexpected change. "When suddenly" places this change within a specific temporal context, linking it to a prior event or state. Using "when" adds an element of narrative flow.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
86%
Authority and reliability
4.5/5
Expert rating
Real-world application tested