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
investigating if
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "investigating if" is correct and usable in written English.
It can be used when you are looking into the possibility or validity of a certain condition or situation. Example: "The researchers are investigating if the new drug has any side effects on patients."
✓ Grammatically correct
News & Media
Science
Alternative expressions(20)
examining whether
checking whether
determining whether
exploring whether
inquiring whether
assessing whether
exploring if
establishing if
investigate if
ascertaining if
inquiring as to whether
regarding as to whether
questioning as to whether
finding out if
know as to whether
considering if
consultation as to whether
checking if
evaluating if
examine if
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
59 human-written examples
Machaalany et al. showed direct costs for investigating IF of ∼US $80 000 per patient in a single-centre study in Canada.
A prosecutor is investigating if the law has been broken.
News & Media
Police are investigating if they had been gang-raped before being killed.
News & Media
He has been investigating if everyday sadism should be added to the cluster — a Dark Tetrad.
News & Media
Gardai are investigating if the woman was travelling with the dead man.
News & Media
In a follow-up study, Dr. Boecker is investigating if running affects pain perception.
News & Media
Senator Grassley has been investigating if the Food and Drug Administration was slow to respond to concerns about Vioxx.
News & Media
The Angels are investigating if there are grounds to void Matthews's contract, or if the team can discipline him.
News & Media
"We are investigating if they are the same persons involved in Pearl murder or not," Brigadier Cheema said.
News & Media
Detectives are investigating if the group was moving material for a possible attack in the near future.
News & Media
Berlin police said they were investigating if the truck was stolen from a construction site in Poland.
News & Media
Expert writing Tips
Best practice
In formal writing, consider using more precise synonyms like "examining whether" or "determining whether" for greater clarity and impact.
Common error
Although often used interchangeably, "investigating whether" is generally considered more grammatically correct and suitable for formal contexts. Use "investigating if" only when the "if" clause expresses a clear condition.
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "investigating if" functions as a connector introducing an indirect question or a conditional clause. It signifies that an inquiry or examination is underway to determine the truth or validity of something. Ludwig examples showcase usage across a range of contexts.
Frequent in
News & Media
57%
Science
43%
Formal & Business
0%
Less common in
Academia
0%
Encyclopedias
0%
Reference
0%
Ludwig's WRAP-UP
In summary, "investigating if" is a commonly used phrase that serves to introduce an inquiry into a specific condition or situation. As Ludwig AI confirms, its usage is grammatically correct and widely applicable, particularly in news and scientific contexts. While "investigating whether" is often considered more formal, "investigating if" remains a versatile and acceptable option, especially in less formal settings. Remember to ensure clarity in your writing by choosing synonyms like "examining whether" for added precision. By understanding its nuances and alternatives, you can effectively incorporate "investigating if" into your writing to convey a sense of inquiry and examination.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
examining whether
This alternative replaces "investigating" with "examining" and "if" with "whether", providing a more formal tone.
researching whether
This alternative implies a more systematic and thorough inquiry, replacing "investigating" with "researching" and "if" with "whether".
exploring whether
This alternative uses "exploring" to indicate a more in-depth investigation, while "whether" replaces "if".
inquiring whether
This phrase is slightly more formal, using "inquiring" instead of "investigating" and "whether" instead of "if".
determining whether
This option emphasizes the goal of reaching a conclusion or decision, replacing "investigating" with "determining" and "if" with "whether".
assessing whether
This alternative emphasizes evaluation, using "assessing" instead of "investigating" and "whether" instead of "if".
checking whether
This is a more informal alternative, substituting "investigating" with "checking" and "if" with "whether".
looking into whether
This is a more colloquial alternative, using "looking into" in place of "investigating" and "whether" in place of "if".
verifying if
This alternative emphasizes the act of confirming something, replacing "investigating" with "verifying".
probing if
This alternative suggests a deeper, more intense inquiry, replacing "investigating" with "probing".
FAQs
What does "investigating if" mean?
The phrase "investigating if" means to inquire into or examine a situation to determine whether a particular condition or event is true or has occurred. For example, "The police are investigating if a crime was committed."
Is it better to use "investigating if" or "investigating whether"?
While both phrases are commonly used, "investigating whether" is often considered more grammatically formal and precise. However, "investigating if" is perfectly acceptable, especially in less formal contexts. Consider using "examining whether" for added formality.
What are some alternatives to "investigating if"?
You can use alternatives such as "checking whether", "determining whether", or "looking into whether" depending on the specific context and the desired level of formality.
How can I use "investigating if" in a sentence?
You can use "investigating if" to introduce a condition or possibility that is being examined. For example, "The scientists are investigating if the new treatment is effective", or "The company is investigating if there was a data breach."
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
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested