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
are of sizes
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "are of sizes" is not correct in standard written English.
It may be intended to describe the varying dimensions of objects, but it lacks clarity and proper structure. Example: "The boxes are of sizes that range from small to large."
⚠ May contain grammatical issues
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
8 human-written examples
These instances are of sizes less than 130, and most of them are 'ftv' instances.
Science
The biosynthesized AuNPs are of sizes ranging from 5 to 57 nm.
Patterns with three-dimensional order, including cubic and noncubic packings of spheres, and a tetragonal intermediate phase, also self-assemble when the lattices are of sizes nearly commensurate with the wavevectors of the bulk equilibrium patterns.
Science
The intervening introns 8, 9, 10 and 11 are of sizes 442, 374, 78 and 180 bp respectively.
Science
The intervening introns 13, 14 and 15 are of sizes 262, 958 and 493 bp respectively, so that amplification of genomic DNA would be expected to yield a product of size 2123 bp.
Science
These are of sizes appropriate to the original sequences used for primer design and the faster and brighter fluorescent band may represent two fragments of nearly the same size.
Human-verified similar examples from authoritative sources
Similar Expressions
51 human-written examples
Both images are of size 500×500.
Both PSFs are of size 21×21.
The test images are of size 256 × 256 pixels.
where all the blocks are of size 2×2.
The rectified images are of size 768×512 pixels.
Expert writing Tips
Best practice
Use alternatives like "vary in size" or "come in different sizes" for clearer and grammatically correct communication.
Common error
Don't use the phrase "are of sizes". It's grammatically awkward. Instead, opt for more precise and standard expressions to describe the dimensions of objects or entities.
Source & Trust
82%
Authority and reliability
2.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "are of sizes" attempts to describe that something exists in multiple dimensions or magnitudes. However, Ludwig AI flags it as not correct in standard written English. The intended meaning involves indicating variance in dimensions.
Frequent in
Science
71%
Wiki
29%
News & Media
0%
Less common in
Formal & Business
0%
Encyclopedias
0%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "are of sizes" is grammatically incorrect and should be avoided in formal writing. Ludwig AI indicates that it is not correct in standard written English. While it appears in some contexts like Science and Wiki sources, opting for alternatives like "vary in size" or "come in different sizes" will ensure clearer and more accurate communication. The best approach is to choose grammatically sound phrases that precisely describe the dimensions or magnitudes being discussed.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
vary in size
Emphasizes the variation in size among different items or objects.
come in different sizes
Highlights the availability of items in multiple sizes.
are available in various sizes
Similar to the previous one, but emphasizes availability.
range in size
Focuses on the spectrum of sizes, from smallest to largest.
have different dimensions
Replaces "size" with "dimensions", suitable for more technical contexts.
are of varying dimensions
Similar to "have different dimensions" but uses a more formal tone.
differ in magnitude
Uses "magnitude" instead of "size", appropriate when referring to quantities.
exhibit a range of sizes
Emphasizes the variety and extent of sizes observed.
show variations in size
Highlights the presence of differences in size among elements.
are available in multiple dimensions
Focuses on three-dimensional measurements.
FAQs
What's a more grammatically sound way to say "are of sizes"?
Instead of "are of sizes", consider using phrases such as "vary in size", "come in different sizes", or "range in size" for better clarity and grammatical correctness.
Is it ever appropriate to use the phrase "are of sizes"?
While the phrase "are of sizes" might appear in some informal contexts, it's generally not considered standard English. It's best to use more grammatically correct alternatives in formal writing and speech.
How can I describe the dimensions of objects without using "are of sizes"?
You can describe the dimensions of objects by saying they "have different dimensions", "exhibit a range of sizes", or "are available in various sizes". These options are more precise and grammatically sound.
What's the difference between "are of sizes" and "vary in size"?
"Are of sizes" is grammatically incorrect, while "vary in size" is a standard and grammatically correct way to express that things have different dimensions or magnitudes. The latter is preferred in formal communication.
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
82%
Authority and reliability
2.8/5
Expert rating
Real-world application tested