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
which both are
Grammar usage guide and real-world examplesUSAGE SUMMARY
"which both are" is grammatically correct and can be used in written English.
For example: She has two cats, which both are quite mischievous.
✓ Grammatically correct
Science
News & Media
Formal & Business
Alternative expressions(6)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified similar examples from authoritative sources
Similar Expressions
59 human-written examples
The standard deduction in his case -- for a married couple in which both are 65 or older -- is $8,500.
News & Media
Both are A2DP compatible which means you can stream audio from your devices via Bluetooth.
News & Media
For example, miR-124 primarily has targets in component 1 and 4, which both are Pdx-1 affected components.
Science
In addition to monosulfated CS-A and CS-C, other forms of CS have been described, such as CS-D and CS-E, which both are disulfated [5].
Science
Apoptosis was identified by the measure of caspase activity (Figure 4B) and analysis with APO 2.7, which both are specific of apoptotic cells [26] (Figure S1).
Science
But if both were 4-2, wasch was more likely, declarer's communications were iffy.
News & Media
All items were graded 0 1 (no – yes), except Depression and Suicide Attempt, which both were graded 0 2 (no – yes).
Two of the thinnest and lightest convertibles were from Sony, with their Vaio Duo Slider Hybrid, and Lenovo's Yoga 2 Pro, both which are 13" and come with the new, long-battery life Haswell chip.
News & Media
Only 2/11 tetracycline susceptible strains carried tet-resistance determinants (tetM and tetL), of which both were E. faecium ST78 strains.
Science
In league play, the Sailors have hung with league favorite Fountain Valley, which is 5-0 in league, Edison and defending league champion Los Alamitos, both of which are 3-2 in league and share second place.
News & Media
Students interested in graduate studies in biomechanical engineering can choose one of the programs below, both of which are 45-unit courses of study.
Academia
Expert writing Tips
Best practice
Use "which both are" to clearly connect a descriptive clause to a pair of items or concepts previously mentioned. Ensure that the items being referred to are unambiguously clear to the reader. For instance, "We considered options A and B, which both are viable solutions".
Common error
Avoid using "which both are" when referring to singular items or more than two items. The phrase is specifically designed for scenarios involving exactly two things, so using it with a different number can cause grammatical errors and confusion. If you want to speak about the group, use "all of which are".
Source & Trust
81%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "which both are" functions as a relative clause, introducing additional information about two previously mentioned entities. It connects a descriptive clause to a pair, indicating that a certain quality or condition applies to both items. As Ludwig AI supports, this phrase is grammatically correct.
Frequent in
Science
45%
News & Media
35%
Academia
10%
Less common in
Wiki
5%
Formal & Business
3%
Encyclopedias
2%
Ludwig's WRAP-UP
In summary, "which both are" serves as a relative clause used to provide extra context about two previously mentioned elements. Ludwig AI confirms that this phrase is grammatically correct, although it is more frequently found in scientific contexts as well as news, and academia. When using the phrase, ensure that it unambiguously refers to exactly two distinct items, and consider alternatives such as "both of which are" to enhance clarity or stylistic variation.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
both of which are
Changes the order and includes "of" for clearer emphasis on the pair.
both of them are
Adds "them" for emphasis and clarity about the reference.
that both are
Replaces "which" with "that" in the relative clause.
both being
Simplifies the relative clause to a participial phrase.
and both are
Replaces the relative clause with a conjunction.
and they both are
Replaces relative clause with a coordinate clause for simplicity.
in which they both are
Adds the pronoun 'they' for a slightly different emphasis.
where both are
Shifts the focus to a location or situation.
each of which is
Focuses on individuality rather than a collective pair.
both elements being
Formalizes to emphasize elements instead of subjects.
FAQs
How can I use "which both are" in a sentence?
Use "which both are" to add extra information about two things you've already mentioned. For example, "The project requires resources and expertise, which both are scarce during this period."
What's a good alternative to "which both are"?
Consider using "both of which are" or "and both are" depending on the context and desired level of formality.
Is "which both are" grammatically correct?
Yes, "which both are" is grammatically correct when used to refer to two previously mentioned items. It introduces a relative clause that provides additional information.
When should I avoid using "which both are"?
Avoid using "which both are" if you're referring to a single item or more than two items. It's specifically for situations where you want to describe two things at once. Use alternatives like "all of which are" or "each of which is" for different quantities.
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
81%
Authority and reliability
4.1/5
Expert rating
Real-world application tested