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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
so do they
Grammar usage guide and real-world examplesUSAGE SUMMARY
'so do they' is correct and usable in written English.
You can use it when you want to make a comparison between two similar actions or ideas. For example, "John likes to ski in the winter, and so do they."
✓ Grammatically correct
News & Media
Science
Academia
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
56 human-written examples
So do they".
News & Media
And so do they.
News & Media
So do they matter?
News & Media
So do they, probably.
News & Media
When the body dies, so do they.
News & Media
If so, do they have criminals?
News & Media
When GDP slows down, so do they.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
4 human-written examples
So did they.
News & Media
More importantly, so did they.
News & Media
But so did they.
News & Media
So did they graduate with honors?
News & Media
Expert writing Tips
Best practice
Use "so do they" to succinctly express agreement or shared behavior without repeating the original verb phrase.
Common error
Ensure the auxiliary verb ("do") matches the tense and number of the original statement. For example, if the original statement uses "is", the agreeing phrase should use "so are they" not "so do they".
Source & Trust
85%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "so do they" functions as an elliptical construction indicating agreement or shared action with a preceding statement. As Ludwig AI confirms, it expresses that the subject 'they' performs the same action as someone or something already mentioned.
Frequent in
News & Media
60%
Science
15%
Academia
10%
Less common in
Wiki
5%
Formal & Business
5%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "so do they" is a grammatically correct and frequently used construction for expressing agreement or indicating shared action. As Ludwig AI confirms, it's a concise way to show that the subject 'they' performs the same action as previously mentioned. Analysis of the examples reveals its prevalence in News & Media, Science, and Academic contexts, suggesting a neutral to slightly formal register. When using the phrase, ensure the auxiliary verb matches the tense of the original statement. Alternatives include "they do too" and "they also do", depending on the desired tone and emphasis.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
they do too
Changes the word order to emphasize 'they' while retaining the meaning of agreement.
they also do
Uses "also" to explicitly indicate addition or similarity in action.
likewise, they do
Introduces a formal tone indicating that what applies to one also applies to the other.
the same applies to them
Shifts the focus to the application of a condition to 'them'.
it's the same for them
Indicates equivalence or similarity of situation using a more conversational tone.
they're the same way
Indicates a similarity in behavior or attitude.
that goes for them too
Expresses that the previously mentioned information applies to them as well.
as they do also
Emphasizes the act or state already mentioned, applying it to 'they'.
they act similarly
Focuses on the comparable actions or behaviors of the subjects.
they are in agreement as well
Indicates that the group is in consensus with a prior opinion.
FAQs
How is "so do they" used in a sentence?
The phrase "so do they" indicates that the subject 'they' performs the same action as someone previously mentioned. For example, "John likes to read, and "so do they"" means that 'they' also like to read.
What are some alternatives to "so do they"?
Alternatives to "so do they" include "they do too", "they also do", or "the same applies to them". The best choice depends on the context and desired level of formality.
Is it correct to say "so they do" instead of "so do they"?
While "so they do" might be grammatically understandable, "so do they" is the standard and more grammatically correct way to express agreement or shared action in English. It uses inversion to show agreement.
What's the difference between "so do they" and "so are they"?
"So do they" is used when the original statement involves an action verb (e.g., "They run fast"). "So are they" is used when the original statement involves a state of being (e.g., "They are happy"). Using the incorrect auxiliary verb can lead to grammatical errors.
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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
85%
Authority and reliability
4.5/5
Expert rating
Real-world application tested