Date: 1100-1200
Language: Old Norse
Origin: their


they S1 W1 [used as the subject of a verb]
1 used to refer to two or more people or things that have already been mentioned or are already known about:
Bob and Sue said they wouldn't be able to come.
Ken gave me some flowers. Aren't they beautiful?
They all want to come to the wedding.

they say/think etc

used to state what people in general say or think:
They say it's bad luck to spill salt.
3 spoken used to refer to a particular organization or group of people:
Where are they going to build the new highway?
They're going to take an X-ray.
4 used when talking about someone who may be male or female, to avoid saying 'he or she':
If anyone has any information related to the crime, will they please contact the police.
Every child, whoever they are, deserves to have a mum and a dad.

You can use they, them, and their to refer to a single person when you do not want to show that the person is male or female. People do this because they want to avoid suggesting that the person can only be male, or using longer expressions such as 'he or she', 'him or her' etc If anyone doesn't like it, they can leave. When a friend upsets you, do you tell them? Someone has left their coat.This use is acceptable and very common in speech, and is becoming more acceptable in writing as well. However, some people consider this use to be incorrect. You can sometimes avoid the problem by making the subject plural If people don't like it, they can leave. When friends upset you, do you tell them?

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