have not been demonstrated

USAGE SUMMARY

The phrase "have not been demonstrated" is correct and usable in written English.
It can be used when discussing evidence or proof that has not been provided or shown for a particular claim or theory. Example: "The effectiveness of the new treatment has not been demonstrated in clinical trials."

✓ Grammatically correct

Science

News & Media

Encyclopedias

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

In addition, some of the technologies in question have not been demonstrated on a commercial scale yet.

The Economist

"Although there is physical evidence that seeding affects cloud processes, effective methods for significantly modifying the weather generally have not been demonstrated," it adds.

The New York Times - Science

A 1978 E.P.A. memorandum acknowledged the toxic substances in sludge but said the risks "just have not been demonstrated to be that great".

The New York Times

Some clinicians believe that one or another of the therapies discussed in this section works better for certain patients, but such beliefs have not been demonstrated by experiment.

Encyclopedia Britannica

"Those products have not been demonstrated to be successful in the main market yet.

TechCrunch

However, the effects of a lower concentration of DAG oil have not been demonstrated.

Atherosclerosis

Importantly, silk materials have not been demonstrated to induce mineralization, except when used in calcified tissues.

Biomaterials

Correlations between load and stream characteristics are complex and have not been demonstrated to be predictive.

Ecological Engineering

However, the photoelectric characteristics and conversion efficiency of MoS2/CdS heterojunction solar cells have not been demonstrated.

Nanoscale Research Letters

It has been shown to reduce vertebral fracture risk but reductions in nonvertebral and hip fractures have not been demonstrated.

Journal of Orthopaedics and Traumatology

Such key properties for high power, energy storage devices have not been demonstrated before with conducting polymer active materials.

Electrochimica Acta

Expert writing Tips

Best practice

Use "have not been demonstrated" when discussing claims or theories that lack sufficient evidence or proof, particularly in formal or scientific contexts. Be specific about what "has not been demonstrated" to maintain clarity.

Common error

While "have not been demonstrated" is grammatically correct, it can sound overly formal in casual conversation. Consider using simpler alternatives like "haven't been proven" or "aren't supported" in informal settings.

Linguistic Context

The phrase "have not been demonstrated" functions as a verb phrase expressing a lack of proof or evidence for a particular claim or assertion. Ludwig AI confirms its grammatical correctness and usability in formal English.

Expression frequency: Very common

Frequent in

Science

76%

News & Media

19%

Encyclopedias

2%

Less common in

Formal & Business

0%

Wiki

0%

Reference

0%

Ludwig's WRAP-UP

The phrase "have not been demonstrated" is a grammatically sound and frequently used expression, especially in scientific and formal contexts. As Ludwig AI confirms, it is employed to indicate a lack of sufficient evidence or proof for a particular claim. While versatile, it's crucial to ensure the tone aligns with the context, opting for simpler alternatives in more casual settings. Remember to use it when you want to express that something lacks sufficient evidence or confirmation.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

have not been proven

Replaces 'demonstrated' with 'proven', emphasizing a lack of conclusive evidence.

have not been shown

Substitutes 'demonstrated' with 'shown', focusing on the absence of visual or factual presentation.

have not been established

Uses 'established' instead of 'demonstrated', highlighting that something hasn't been firmly set or recognized.

have not been validated

Indicates that something hasn't been confirmed or proven true.

have not been verified

Similar to 'validated', but focuses on confirming accuracy or correctness.

lack evidence

A more concise way to express the absence of supporting facts.

are not supported by evidence

Emphasizes that there is no evidence to back up a claim or statement.

remain unproven

Highlights that something is still lacking proof or confirmation.

are unsupported

A shorter, more direct way to say that something lacks support or evidence.

evidence is lacking

Focuses on the lack of available proof or data.

FAQs

How can I use "have not been demonstrated" in a sentence?

You can use "have not been demonstrated" to indicate that there is a lack of proof or evidence for something. For example, "The benefits of this new drug "have not been demonstrated" in clinical trials."

What can I say instead of "have not been demonstrated"?

Alternatives include "have not been proven", "have not been shown", or "lack evidence", depending on the context.

When is it appropriate to use "have not been demonstrated"?

"Have not been demonstrated" is suitable in formal writing, scientific reports, and when discussing the validity of claims or theories. It's often used when discussing something that "remains unproven".

Is "have not been demonstrated" the same as "has not been demonstrated"?

No, "have not been demonstrated" is used with plural subjects (e.g., 'the effects') or with 'I/you/we/they', while "has not been demonstrated" is used with singular subjects (e.g., 'the effect' or 'he/she/it').