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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
they probably were
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "they probably were" is correct and usable in written English.
It can be used when expressing a likelihood or assumption about a past situation involving a group of people. Example: "Based on their behavior at the party, they probably were having a great time."
✓ Grammatically correct
News & Media
Science
Encyclopedias
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
57 human-written examples
(They probably were stolen).
Encyclopedias
And they probably were.
News & Media
Well, they probably were once.
News & Media
To be fair, they probably were.
News & Media
They probably were, though they never pushed it.
News & Media
Then I realized they probably were really designed for.
News & Media
They look as if they were made for each other, which they probably were.
News & Media
They probably were spooned onto the dish just before it was served.
News & Media
Their precise origin is unknown, but they probably were manufactured in the Mediterranean.
Encyclopedias
"They probably were eating more" than they jotted down, Mr. Rosenkilde speculates.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
1 human-written examples
They probably aren't.
News & Media
Expert writing Tips
Best practice
When aiming for a more formal tone, consider alternatives like "it is probable that they were" or "they were likely". While grammatically correct, these alternatives add unnecessary length in casual writing.
Common error
Avoid using "they probably were" when you have concrete evidence or undeniable proof. The phrase implies uncertainty. Use stronger assertions when certainty exists. If you have absolute certainty, then rephrase it to "they were" instead.
Source & Trust
85%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "they probably were" serves as an adverbial phrase, modifying a verb or clause to indicate a degree of likelihood or probability regarding a past state or action. As Ludwig AI confirms, it is both grammatically correct and widely applicable in written English.
Frequent in
News & Media
67%
Science
19%
Encyclopedias
3%
Less common in
Wiki
6%
Formal & Business
2%
Social Media
1%
Ludwig's WRAP-UP
In summary, the phrase "they probably were" is a grammatically correct and commonly used adverbial phrase to express a degree of likelihood about a past event or situation involving a group of people. Ludwig AI validates its correctness and general applicability. While the phrase can appear in a variety of contexts, it's most frequent in news articles, scientific publications and encyclopedias. Keep in mind that if you are expressing certainty about something that was, then the correct structure is to avoid the word "probably" and use "they were".
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
they likely were
Replaces "probably" with "likely", indicating a strong possibility.
they presumably were
Substitutes "probably" with "presumably", suggesting an assumption based on reasonable evidence.
it's probable they were
Rephrases the sentence structure to emphasize the probability itself.
it is likely they were
Rephrases the sentence structure to emphasize the likelihood itself.
they might have been
Uses "might have been" to express a possibility, which is slightly weaker than "probably were".
they could have been
Similar to "might have been", indicating a possibility rather than a strong likelihood.
it's possible they were
Expresses a potential scenario using "possible" instead of "probable".
they may have been
Another way to suggest a possibility, similar in strength to "might have been".
one can assume they were
Shifts the focus to the act of assuming, implying a conclusion drawn from available information.
chances are they were
Uses an idiomatic expression to indicate a high probability.
FAQs
How can I use "they probably were" in a sentence?
Use "they probably were" to express a likely scenario or assumption about a group's actions or state in the past. For example: "Based on their laughter, "they probably were" enjoying the show".
What phrases are similar to "they probably were"?
Alternatives include "they likely were", "they presumably were", or "they might have been", each conveying varying degrees of certainty.
Is it correct to say "they probably was"?
No, "they probably was" is grammatically incorrect. The correct form is "they probably were" because "they" is a plural pronoun and requires the plural form of the verb "to be", which is "were".
What's the difference between "they probably were" and "they were probably"?
While both phrases are grammatically correct and convey a similar meaning, "they probably were" places slightly more emphasis on the "were", while "they were probably" might sound more conversational. The choice often depends on the desired rhythm and emphasis in your sentence.
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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