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
either of which are
Grammar usage guide and real-world examplesUSAGE SUMMARY
"either of which are" is a correct and usable phrase in written English.
You can use it when you want to refer to two or more alternatives, indicating that each option is equally valid. For example: "I could either take the bus or ride my bike to work, either of which are good options."
✓ Grammatically correct
Science
News & Media
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
3 human-written examples
Two other factors that will drive up the true external costs of energy are the impacts on ecosystems and the impacts on national security—either of which are extremely difficult to value.
The truth appears to be that either NATO didn't know or it knew and didn't care -- either of which are unacceptable.
News & Media
A low RCR (Fig. 1A), combined with ATP deficiency (Fergestad et al., 2006; Terhzaz et al., 2010), as verified here (Fig. 1B), thus reflects either increased proton leak across the inner mitochondrial membrane and/or a limitation on ATP synthesis, either of which are plausible molecular consequences of the sesB mutation, which affects the final transmembrane segment of the protein.
Human-verified similar examples from authoritative sources
Similar Expressions
57 human-written examples
They were either violent or apathetic, neither of which is good.
News & Media
The other study used the presence of either pulmonary oedema or cardiomegaly, neither of which was objectively quantified.
Science
Authorities are not testing for prescription benzodiazepines and painkillers either, both of which are some of the drugs that most heavily impair driving.
News & Media
In the centre of the ground floor is a porch, on either side of which are two 3x2 sash windows, plus a narrow two-pane window.
Wiki
Directly below Wisden is a plaque, on either side of which are the emblems of the English and West Indian teams.
Wiki
; Cave 18 Cave 18 is a dining hall with a front wall and a grooved doorway, on either side of which are windows.
Wiki
He noticed that the government is trying to sell 14 ships, all of which are either at the bottom of or on the beach of some distant harbor.
News & Media
It's especially pertinent experience now that SC Johnson generates $10 billion in sales of its household products such as Windex, Glade, Ziploc, Shout and Pledge, most of which are either made of or packaged in plastic.
News & Media
Expert writing Tips
Best practice
Use "either of which are" to clearly present two or more valid options or conditions, ensuring the context implies a plural subject. For example: "Both solutions have drawbacks, either of which are significant obstacles."
Common error
Avoid using "either of which is" when the context implies multiple subjects or options. "Either of which is" is suitable for singular subjects. For example, instead of "The cars, either of which is fast", use "The cars, either of which are fast".
Source & Trust
86%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "either of which are" functions as a connective or linking phrase, introducing one or more alternatives or options, with the condition that each option is valid or relevant. Ludwig AI affirms its correct usage.
Frequent in
News & Media
33%
Science
50%
Wiki
17%
Less common in
Formal & Business
0%
Encyclopedias
0%
Social Media
0%
Ludwig's WRAP-UP
In summary, "either of which are" is a grammatically correct phrase used to present multiple options or alternatives, where at least one is valid. Ludwig AI confirms its proper usage across various contexts, including news, science, and general writing. It's crucial to maintain subject-verb agreement when using this phrase, ensuring the verb aligns with the plural subject. While interchangeable with alternatives like "each of which is" or "any of which is", the choice depends on the specific context and desired emphasis. This phrase helps to convey choices and alternatives effectively in your writing.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
each of which is
Emphasizes the individual characteristic of each option.
any of which is
Singular agreement, emphasizes individual validity.
any of these is
More direct, referring to a specific set.
both of which do
Similar meaning when referring to two options, indicates action.
either one is
Highlights the singular nature of each choice.
any of which satisfy
Adds a condition or requirement.
either option fulfills
Formal tone, suggests a fulfillment.
each alternative provides
Suggests a provision or result from each choice.
either selection meets
Suggests a suitability or qualification.
any selection available is
Expands to include availability of choices.
FAQs
How can I use "either of which are" in a sentence?
Use "either of which are" to introduce alternatives or choices when referring to multiple options. For example, "The project allows for two approaches, "either of which are" acceptable".
What phrases can I use instead of "either of which are"?
Alternatives include "each of which is", "any of which is", or "both of which do", depending on the context and the number of options being discussed.
Is it correct to say "either of which is" or "either of which are"?
The correct form depends on whether you're referring to a singular or plural subject. Use "either of which is" for a singular subject and ""either of which are"" for a plural subject.
What is the difference between "either of which are" and "neither of which are"?
"Either of which are" indicates that at least one of the options is valid or acceptable, while "neither of which are" indicates that none of the options are valid or acceptable.
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
86%
Authority and reliability
4.1/5
Expert rating
Real-world application tested