It has long been known vs It has been known for long

Both phrases are correct, but they are used in slightly different contexts. 'It has long been known' is a more common and natural way to express that something has been known for a considerable amount of time. On the other hand, 'it has been known for long' is less common and may sound a bit awkward to native English speakers.

Last updated: March 24, 2024 • 16441 views

It has long been known

This phrase is correct and commonly used in English to indicate that something has been known for a significant period of time.

This phrase is used to convey that a fact or information has been known for a considerable duration.

Examples:

It has long been known that exercise is good for health.
It has long been known that smoking is harmful.
It has long been known that the Earth is round.

Show examples from the web [+]

It has long been known that the TAC system is inefficient and that it is one of the factors behind the growing incidence of discards in the Baltic Sea, resulting in tonnes of caught fish going to waste.
It has long been known that people who are exposed to acrylamide for long periods could sustain damage to their nervous system, develop cancer and suffer permanent genetic damage.
It has long been known which virus causes the disease.
It has long been known to relieve pain, such as that in your leg, and it also calms disturbances of the bowel.
It has long been known to relieve pain, such as that in your leg, and it also calms disturbances of the bowel.
It has long been known that special AWACS aircraft are used for the purpose of locating other aircraft over long distances.
"It has long been known that dreams of water signify 'imminent' or 'wished for' birth...!"
Mr President, it has long been known that mercury compounds are harmful to human beings and to the environment.
Amity Island has long been known for its clean air, clear water and beautiful white-sand beaches.
The genetic identity of the virus has long been known.
The diagnosis has long been known.
The proposed transition period for adopting housing standards would mean some animals continue to be kept in housing which has long been known to be substandard.
Zhenjiang City has long been known as the 'City in the mountain forest and Home of Vinegar'.
The size of the budget has long been known: just under 1% of GNI, which means around EUR 120.3 billion for 2008.
The effects of asbestos on health have long been known.
By illegally reducing the number of sessions for 2004 from 12 to 10, a coalition of honourable Members, whose antipathy to the notion of Strasbourg as seat of the European Parliament has long been known, has seriously undermined the treaties.
For instance, in the UK, swayback is a disease which has long been known to affect sheep, and the link between this disease and copper deficiency has been demonstrated in several countries.
For Grant Matthews has long known and loved the clean, rich smell of fresh turned Earth.
We submitted a report on this as part of the 2001 budgetary procedure and made it clear that, of course, these abnormal commitments, which have long been known as dormant commitments, must be reduced as soon as possible.
Deplores the fact that no earlier action had been taken in areas where problems had long been known;

Alternatives:

It has been known for a long time
It has been known for a while
It has been known for ages
It has been known for centuries
It has been known for a considerable period

It has been known for long

This phrase is grammatically correct but less common in English. It may sound a bit awkward to native speakers.

This phrase can be used to convey the idea that something has been known for a significant duration, but it is less commonly used than 'it has long been known.'

Examples:

It has been known for long that she is a talented singer.

Show examples from the web [+]

It has been known for a long time that a European company statute would considerably increase transfrontier activity and substantially reduce legal costs.
All this has been known for a long time, like the expected doubling of the air traffic flow in the next fifteen years.
It has long been known that people who are exposed to acrylamide for long periods could sustain damage to their nervous system, develop cancer and suffer permanent genetic damage.
Amity Island has long been known for its clean air, clear water and beautiful white-sand beaches.
These are called motor command neurons that have been known for a long time.
It's been known for a long time, you can't tickle yourself as well as other people can.
The problems involving copper pollution and overconsumption have been known for a long time.
It has, for example, been known for a long time that the countries around the Indian Ocean had no system of warnings against not only tsunamis but also other major disasters, especially cyclones.
It has been known for some time that meat consumption has significant adverse effects on the environment.
It has been known for some time that the use of laser printers causes dust particles and chemical pollutants to be released.
It has been known for some time that there is a Fed formula in the United States.
Benzene has, in fact, been known for a very long time as a powerful carcinogen.
Most of the contracts concerned are framework contracts and their expiry dates have been known for a long time, since 2002 in one case.
The clinical pictures and problems concerning well-being have been known for a long time, and yet no date has yet been set for these proposals.
It has long been known which virus causes the disease.
It has long been known to relieve pain, such as that in your leg, and it also calms disturbances of the bowel.
It has long been known to relieve pain, such as that in your leg, and it also calms disturbances of the bowel.
Mr President, it has long been known that mercury compounds are harmful to human beings and to the environment.
It has been known for some years that bush animals can be carriers of diseases like Monkey Pox, SIV, Hepatitis and Ebola, which are potentially fatal for humans.
It has been known for some years that some British, French and Italian importers are importing set-top boxes under a different tariff heading, namely 85281294.

Alternatives:

It has long been known
It has been known for a long time
It has been known for a while
It has been known for ages
It has been known for centuries

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It has long been known vs It has been known for long