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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
either then
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "either then" is not correct as written.
It should be "either," or "then" depending on the sentence structure. For example: I needed to leave work early, so I either left then or at the end of the day.
⚠ May contain grammatical issues
News & Media
Science
Wiki
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
If people tell me they've never had either, then I've got a bridge I'd like to sell them.
News & Media
If you have all women or all men or a disproportionate number of either then you are not going to get the diversity of views".
News & Media
If you're not yet sure you want an unfamiliar reporter chatting at you all night – I wouldn't be either – then just have a look at my Twitter feed.
News & Media
Either, then, a part of fire is not fire, so that there is a body prior to the element-for every body is either an element or composed of elements-or not every body is divisible.
If you haven't played either, then the reverent tone inspired by lead designer Fumito Ueda's work might seem off-putting, or at least too awestruck for any last-gen game to justify.
News & Media
If you can do either, then you earn the right to send them your resume.
News & Media
God is either then cruel or helpless, as regards all finite ill of the sort that Job endures".
Science
http://mathworld.wolfram.com This site, too, is very good although some of the articles tend to be either then or overly technical at the expense of clarity.
Academia
However, if right reason, which governs the universe, decides that one will not have either, then the sage follows right reason.
Science
And Clift says, "Uhm...we haven't had a woman president either!" Then there is yelling.
News & Media
I do not know anything about Holmes' mental state (either then or now) and have no involvement in the case.
News & Media
Expert writing Tips
Best practice
When intending to show a choice, use "either...or". When indicating a sequence, use "then" after a condition. Avoid combining them directly as "either then".
Common error
Avoid using "either then" as a direct conjunction. It's often a sign of combining two different grammatical structures incorrectly. Break down your sentence to use "either...or" for choices or "then" for conditional sequences.
Source & Trust
81%
Authority and reliability
2.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "either then" functions incorrectly as a conjunction. Based on Ludwig AI, the construction is grammatically flawed, often resulting from a misunderstanding of how to properly use "either" to present choices or "then" to indicate sequence or consequence. Examples show attempts to use it in conditional or sequential contexts, but the structure is non-standard.
Frequent in
News & Media
39%
Wiki
32%
Science
19%
Less common in
Academia
5%
Encyclopedias
3%
Formal & Business
2%
Ludwig's WRAP-UP
The phrase "either then" is frequently encountered, but as Ludwig AI points out, it's grammatically incorrect. It often appears in informal writing, particularly in news articles and wiki pages. The intended purpose is usually to link a choice or condition with a subsequent event, but the phrasing is non-standard and should be avoided in formal contexts. For clarity, replace it with appropriate constructions using "either...or" for choices, or "then" for sequences. Always prioritize grammatical accuracy for clear communication.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
therefore
Single word that replaces the conjunction.
consequently
Single word that replaces the conjunction.
as a result
Phrase indicating a direct outcome or effect.
in that case
Highlights a specific condition leading to a particular action or decision.
subsequently
Implies an action follows another in time or sequence.
afterward
Indicates an event occurring at a later time.
thereupon
Formal way to say immediately after that.
following that
More descriptive phrase to specify what comes next.
in turn
Highlights a chain reaction or sequence of events.
by extension
Introduces an idea related or derived from a previous point.
FAQs
How should I correctly use "either" and "then" in a sentence?
"Either" should be paired with "or" to present a choice (e.g., "You can "either stay or leave""). "Then" indicates a sequence or consequence (e.g., "If it rains, "then we will cancel"").
What's the difference between "either...or" and using "then"?
"Either...or" presents two or more options, while "then" indicates what happens next, often as a result of a condition being met. They serve different grammatical functions.
Is "either then" ever correct in a sentence?
Rarely. The phrase "either then" is generally grammatically incorrect. It might appear when "either" modifies one part of a clause and "then" introduces a subsequent clause, but this is uncommon and can usually be phrased more clearly.
What are some common mistakes people make when using "either" and "then"?
A common mistake is using "either" alone to mean "also" or "too". Another is incorrectly combining "either" and "then" as a single conjunction, when they should be used in separate clauses with distinct meanings. For example, do not say "I don't like apples either then I don't like oranges".
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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
81%
Authority and reliability
2.8/5
Expert rating
Real-world application tested