Pronoun (they)

[Ferdie]

Every person has rights under the law, but they don't always know them.

Can you please explain to me why the sentence above is correct. Please see the words in bold face.

Thanks in advance.

[Marius Hancu]

"They" is a general impersonal pronoun in this case, able to replace anything in the singular or plural, which it does by replacing "every person."

[Marius Hancu]

Read the last note on usage here:

http://www.merriam-webster.com/dictionary/they