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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
on alternating days
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "on alternating days" is correct and usable in written English.
You can use it to describe an activity or event that occurs every other day. Example: "The gym is open for classes on alternating days, so check the schedule before you go."
✓ Grammatically correct
News & Media
Science
Wiki
Alternative expressions(20)
on separate occasions
at various times
on other dates
on multiple dates
on certain dates
on different timelines
on alternate days
every other day
at different points in time
on several dates
on different dates
on varying days
sporadically
on alternating weeks
every two days
at staggered intervals
on individual dates
every second day
on various dates
intermittently
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
50 human-written examples
As is typical of their collaborations, they were directing the film on alternating days: one supervised the set while the other worked on a rough edit of the previous day's shots — a time-saving technique developed on the perpetually rushed productions they are used to.
News & Media
At analysis date eight patients had completely discontinued immunosuppression, two used only local therapy, one used cyclosporin 50 mg twice daily on alternating days with 10 mg prednisone, and one took 10 mg prednisone daily.
Science
However, the off-label use of HIV-labelled lamivudine would require an alternative dosing regimen by administration on alternating days and/or by dividing the pills, which we consider impractical in reality.
Science
Recess has since been restored in Wyckoff's middle school, and on alternating days in elementary schools.
News & Media
In Long Beach Township, officials first tried to limit the sale of ice cream to alternating blocks on alternating days.
News & Media
The generators allow them to supply about three-quarters of the town with water on alternating days, he said.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
10 human-written examples
Each patient was given1 session per day 3 times a week (on alternate days).
Science
It is raked and turned over entirely on alternate days.
News & Media
and four of the other with saline on alternate days.
Science
On alternate days they were placed in the preferred compartment.
Science
On alternate days — rest days, he calls them — he runs an hour and a half.
News & Media
Expert writing Tips
Best practice
For clarity, specify the starting day when using "on alternating days", especially when the context isn't immediately clear. For example: "The medication should be taken on alternating days, starting Monday."
Common error
Avoid using "on alternating days" when you actually mean consecutive days. "Alternating" implies a gap, while consecutive means following one after another without interruption.
Source & Trust
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "on alternating days" functions as an adverbial phrase, modifying a verb to specify when an action or event occurs. It describes the timing or frequency of the action. As Ludwig AI confirms, it's a correct and usable phrase.
Frequent in
News & Media
49%
Science
41%
Wiki
8%
Less common in
Formal & Business
0%
Encyclopedias
0%
Reference
0%
Ludwig's WRAP-UP
In summary, "on alternating days" is a common and grammatically sound phrase used to describe actions or events that occur every other day. As Ludwig AI indicates, it is considered correct and usable in written English. It maintains a neutral tone and is primarily found in news, scientific, and wiki contexts. For clarity, always specify the starting day when using this phrase. Consider using alternatives like "every other day" for conciseness, or "on alternate days" for a near-identical meaning. Be careful not to confuse it with consecutive actions.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
every other day
More concise and common alternative.
on alternate days
Synonymous and grammatically interchangeable.
every second day
Emphasizes the numerical sequence.
every two days
Focuses on the duration between occurrences.
intermittently
Implies irregular intervals, but close in meaning.
sporadically
Suggests less frequent and more irregular occurrences.
at intervals
General term for occurrences separated by periods of time.
day after day
Highlights the repeated nature with a one-day gap.
taking turns each day
Focuses on the act of rotation between days.
bi-diurnally
A more formal and less common way to express "twice a day" but not strictly "on alternating days".
FAQs
How can I use "on alternating days" in a sentence?
You can use "on alternating days" to describe events or actions that happen every other day. For instance, "The museum is open to the public "on alternating days"" or "I take this medication "on alternating days"".
What is a simple substitute for "on alternating days"?
A simpler substitute for "on alternating days" is "every other day". It carries the same meaning and is often more concise.
Is it better to say "on alternate days" or "on alternating days"?
Both "on alternate days" and "on alternating days" are correct and largely interchangeable. The choice often comes down to personal preference, although "every other day" is generally more common.
How does the frequency of "on alternating days" compare to "daily" or "weekly"?
"On alternating days" indicates a frequency that is less than "daily" but more frequent than "weekly". It represents an occurrence every two days, providing a balance between consistent action and intermittent rest or change.
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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
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested