their behaviour is vs their behaviour are

The correct phrase is 'their behaviour is.' In English, 'behaviour' is a singular noun, so it should be paired with the singular verb 'is.' Using 'are' would be incorrect as it is a plural verb.

Last updated: March 22, 2024

their behaviour is

This phrase is correct in English. 'Behaviour' is a singular noun, so it should be paired with the singular verb 'is.'

Use 'their behaviour is' when referring to the actions or conduct of a group of people. This phrase is commonly used in English.

Examples:

Their behaviour is unacceptable.
I appreciate that their behaviour is improving.
Do you think their behaviour is appropriate?
It's clear that their behaviour is influenced by external factors.
Their behaviour is a reflection of their upbringing.

Show examples from the web [+]

Stakeholders must know precisely how their behaviour is regulated,
Specific action in terms of informing citizens and raising their awareness, including as far as their behaviour is concerned, is essential.
Their transfer behaviour is largely determined by the controllers as well as by the passive elements in the system.
But we cannot just ask workers to change their behaviour, which is why companies too have a new role in this area.
We must ensure that our citizens and businesses do not receive unsolicited e-mail, that their personal details are not included in telephone directories without their permission, and that their surfing behaviour is not secretly registered via cookies.
Even if these results are not fully reflected by consumers in their shopping behaviour, there is a clear potential for the market to give greater prominence to higher standards as a competitive tool.
Their economic and financial behaviour is similar to that of financial corporations. Therefore, they are treated as separate institutional units.
The awareness of individuals should therefore be directed at personal health and hygiene as well as the ecological consequences of their daily behaviour, which is why a significant amount of development aid should go into supporting education.
Pressure from both the European Union and the USA and other players for access to biofuels, particularly ethanol, instead of better controls on their consumers' behaviour, is another danger for the rainforest and food security.
This could convince our partners to change their behaviour.
People know how erratic her behaviour is.
Jesse's behaviour is clearly causing problems in that marriage.
Nonsensical repetitive behaviour is common in mental illness.
An example of machine behaviour is drift.
It seems to be the right language to describe their behaviour.
These great men can be very strange and sudden in their behaviour.
Their behaviour rose suspicions of what would occur the next days.
I've forgiven them immediately their behaviour from the other night.
Encouraging consumers to modify their behaviour;
I have to say that I think their behaviour here has been shameful.

Alternatives:

his behaviour is
her behaviour is
its behaviour is
the behaviour is
your behaviour is

their behaviour are

This phrase is incorrect in English. 'Behaviour' is a singular noun, so it should be paired with the singular verb 'is.' Using 'are' would be grammatically wrong.

Show examples from the web [+]

The values espoused by individuals and their behaviour are influenced by what the people in question view as the norm in their social environments.
Multinational firms will only change their behaviour when they are forced to pay heavily for their misdeeds.
Their rituals and behaviour are linked to a past no man ever witnessed.
In actual fact, through their behaviour the Vietnamese authorities are contradicting their grand declarations in favour of reforms and democracy.
It is for each institution to ensure that all the rules which govern the behaviour of their officials are applied both within their institution and in their relations with the outside world.
In addition a firm appeal must be made to citizens, with a clear call to those suffering from or carrying certain communicable diseases to assume responsibility, since their personal behaviour and solidarity are essential factors in curbing and controlling the transmission of these diseases.
This could convince our partners to change their behaviour.
It seems to be the right language to describe their behaviour.
These great men can be very strange and sudden in their behaviour.
Their behaviour rose suspicions of what would occur the next days.
I've forgiven them immediately their behaviour from the other night.
Stakeholders must know precisely how their behaviour is regulated,
Encouraging consumers to modify their behaviour;
I have to say that I think their behaviour here has been shameful.
However, we know that flu viruses are genetically unstable and their behaviour cannot be predicted.
These were right-wing extremists, and their behaviour in public was such as to jeopardise public safety.
Wild birds may present special problems in terms of their behaviour and health when in a laboratory situation.
Therefore, anti-competitive coordination of their behaviour due to the transaction is unlikely considering the limited competitive constraints between them.
These factors indicate the likelihood of the parties coordinating their behaviour in the market.
The fact that the parties are competitors does not automatically cause the coordination of their behaviour.

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their behaviour is vs their behaviour are