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The Mayfield Handbook of Technical & Scientific Writing
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Usage Glossary: A B C D E F G H I K L M N O P Q R S T U V W Y


Their is the possessive form of they. There is either an expletive or an adverb. They're is a contraction of they are.

The chemists revised their report.

There are three possible software solutions. [expletive]

The hotel is hard to find, but the committee members are all staying there. [adverb]

They're going to finish the project tomorrow.

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## their/there/they're ##
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