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
observes since
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "observes since" is not correct and does not convey a clear meaning in written English.
It is unclear in its usage without additional context, as "observes" typically requires a direct object or a specific context to make sense. Example: "He observes since the beginning of the experiment that the results have been consistent."
⚠ May contain grammatical issues
News & Media
Science
Alternative expressions(1)
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
3 human-written examples
There is no selection bias, she observes, since this is a randomised trial.
News & Media
"It's been a year and a half," Holly wryly observes, "since anyone shined my shoes".
News & Media
The disease (perhaps syphilis) spread, and Rimbaud died in 1891, at 37. Appropriately to value this new biography, which I believe to be superior to all its predecessors in English or French (for as its author observes, "since the last full biographies of Rimbaud+...+a great deal of new information has come to light"), some note must be taken of Robb's previous books.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
56 human-written examples
The data released showed the arctic sea beginning to refreeze again in the last few days after the most dramatic melt observed since satellite observations started in 1979.
News & Media
These are the highest rates observed since researchers started making satellite observations 20 years ago.
News & Media
In our field observations, seedling recruitment has not been observed since 1995.
Science
The significant improvement in stomach cancer survival in England and Wales since 1990 continues the trend observed since the early 1970s.
Science
A ceasefire across the line observed since 2003 has frayed.
News & Media
"Nevertheless, in cumulative terms, the slowdown observed since the beginning of the year appears to have stabilized".
News & Media
The tides of the Atlantic Ocean have been observed since ancient times.
Encyclopedias
The current Taylor troupe is the finest I've observed since at least the early 1990s.
News & Media
Expert writing Tips
Best practice
When intending to express an ongoing action that started in the past, use the present perfect tense with "observe". For example, use "has observed since" instead of "observes since".
Common error
Avoid using the simple present tense "observes" to describe actions that began in the past and continue to the present. This often leads to grammatical errors. Make sure to select the correct tense.
Source & Trust
88%
Authority and reliability
2.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "observes since" attempts to connect an action of observing with a starting point in time. However, it requires a more complete verb phrase to be grammatically sound. Ludwig AI indicates that this phrase is not correct in written English.
Frequent in
Science
50%
News & Media
50%
Formal & Business
0%
Less common in
Encyclopedias
0%
Wiki
0%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "observes since" is generally considered grammatically incorrect. Ludwig AI confirms this assessment. To properly express an action that began in the past and continues to the present, use the present perfect tense, such as "has observed since". While the phrase appears in both scientific and news contexts, its grammatical incorrectness impacts its overall usability. Consider alternatives like "has noted since", "noticed since", or "detected since" depending on the context to ensure grammatical accuracy.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
has observed since
This alternative introduces the auxiliary verb 'has' to create a present perfect tense, indicating an action that started in the past and continues to the present.
noticed since
Replaces 'observes' with 'noticed', implying a casual awareness or perception of something from a specific point in the past to the present.
observed from
Uses 'observed from' to indicate a viewpoint or timeframe where the observation began.
has noted since
Employs 'has noted' to suggest a formal recording or recognition of something ongoing.
detected since
Replaces 'observes' with 'detected', useful in scientific contexts for identifying phenomena from a past point.
seen since
Uses 'seen since' as a simpler alternative to 'observed since', suitable for informal contexts.
witnessed since
Substitutes 'observes' with 'witnessed', often used to convey witnessing a significant event that continues to have implications.
monitored since
Replaces 'observes' with 'monitored', which implies a systematic and continuous tracking of something over time.
found since
Uses 'found since' to indicate a discovery that has persisted from a particular time.
ascertained since
Replaces 'observes' with 'ascertained', suggesting a conclusive determination of something that has been ongoing.
FAQs
What is the correct way to use "observe" when referring to something that started in the past?
Use the present perfect tense, such as "has observed since", to indicate an action that began in the past and continues to the present.
What are some alternatives to "observes since" that correct its grammatical issues?
You can use phrases like "has noted since", "noticed since", or "detected since" depending on the context.
How can I avoid tense errors when using the word "observe"?
Ensure that the tense of "observe" matches the intended meaning. Use the present perfect tense (e.g., "has observed") when discussing ongoing actions that started in the past; otherwise, use a simple past tense (e.g., "observed") for finished actions.
Is "observes since" grammatically correct?
No, "observes since" is generally considered grammatically incorrect. It's better to use "has observed since" to convey the intended meaning of an action that started in the past and continues to the present.
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
88%
Authority and reliability
2.8/5
Expert rating
Real-world application tested