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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 of these sites
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "either of these sites" is correct and usable in written English.
It can be used when referring to one of two options or locations being discussed. Example: "You can choose either of these sites for your project, as both have their advantages."
✓ Grammatically correct
Science
News & Media
Formal & Business
Alternative expressions(20)
any these
none of those
each of these sites
either is the case
in one of these
either using these
either of these
any one of these
one of these
any of these
either of such
one of its
neither of these
either one of these
its two
one or other of these
one or the other of these
both of these
anyone of those
everyone of those
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
16 human-written examples
By having a representative from either of these sites handle the negotiating, buyers could conceivably avoid setting foot in a showroom except to sign the contract and take the keys.
News & Media
Who's Going feels social transactions are much harder to quantify ("I thought he was a dork"), than financial transactions ("He didn't ship the package") and is hoping that users will comment on each other's profiles to demonstrate a relationship — i.e. "Hey, I had a great time!" It's tough to say whether either of these sites will make it — they need participation.
News & Media
Abnormal neurotransmission at either of these sites could disrupt a circadian regulation of premature responses in NK1R-/ mice.
Science
No evidence yet exists for phosphorylation of either of these sites in vivo.
Mutations at either of these sites allowed Coro1B to compete for binding to F-actin.
Science
We found little evidence to support either of these sites as a substantial source of hemorrhage.
Human-verified similar examples from authoritative sources
Similar Expressions
43 human-written examples
It would be interesting to test if engineering either of these splice site mutations into other genes would also confer conditional gene function.
Science
An inhibitor bound at either or both of these sites might prevent binding and activation of RhoA.
Science
The experimental structures of the template−ligand complexes showed that the ligands bind to either one of these sites.
Science
The human COX-2 promoter contains two NFAT binding sites and COX-2 lucifereporterorter vectors that selectively lacked either one or both of these sites were used to further assess the importance of NFAT as a regulator of the COX-2 promoter (schematic in Figure 5A).
Science
Nevertheless, not all mtrm sequences show conservation of these sites either (Table 2).
Science
Expert writing Tips
Best practice
When using "either of these sites", ensure there are explicitly only two sites being referenced. If there are more than two, consider using "any of these sites" or "one of these sites" for broader applicability.
Common error
Avoid using "either of these sites" when referring to more than two options. This phrase is specifically for scenarios with two choices. Using it otherwise creates ambiguity and grammatical errors. Instead, consider using alternative phrases such as "any of these sites".
Source & Trust
84%
Authority and reliability
4.3/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "either of these sites" functions as a prepositional phrase, specifying a selection between two options. Examples from Ludwig illustrate its use in scientific, news, and transactional contexts, denoting a choice between two locations, sources, or websites.
Frequent in
Science
52%
News & Media
29%
Formal & Business
19%
Less common in
Ludwig's WRAP-UP
In summary, the phrase "either of these sites" is a prepositional phrase used to denote a choice between two specific locations or websites. As affirmed by Ludwig AI, its usage is grammatically correct and common across various contexts, primarily in science and news media. When writing, ensure you use this phrase only when referring to precisely two options to avoid ambiguity. Alternative phrases like "any of these sites" or "one of these sites" are better suited for situations involving more than two choices.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
one of these sites
Focuses on selecting a single site from the group, similar to "either of these sites".
any of these sites
Indicates that any site from the provided list is acceptable.
each of these sites
Emphasizes individual consideration or action at every location.
both of these sites
Specifically refers to actions or properties applicable to both locations.
one or the other of these sites
Highlights the selection between exactly two options, creating a sense of mutual exclusivity.
one of the two sites
Reduces the reference to two options, suitable in a specific context.
any one of the sites
Focuses on a single selection with flexibility.
either location
Uses "location" instead of "site" to convey same meaning.
any location from the list
Broader reference using “any” to specify flexible alternatives.
one place from the list
A simplistic rewording specifying one item.
FAQs
When is it appropriate to use "either of these sites"?
Use "either of these sites" when you are referring to one option from a set of exactly two locations or websites. If there are more than two, phrases like "any of these sites" or "one of these sites" are more suitable.
What's the difference between "either of these sites" and "any of these sites"?
"Either of these sites" implies a choice between two specific options, whereas "any of these sites" suggests that any selection from a group of three or more is acceptable.
Can I use "either of these sites" when discussing more than two websites?
No, it is grammatically incorrect to use "either of these sites" when referring to more than two websites. Use "any of these sites" or "one of these sites" instead.
What are some alternatives to "either of these sites" that work in various contexts?
Depending on the context, you could use phrases such as "one of these sites", "any of these sites", or "both of these sites". The best choice depends on whether you are emphasizing a single choice, any option, or both options.
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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
84%
Authority and reliability
4.3/5
Expert rating
Real-world application tested