Their, there or they're: which is correct?

Correct
their (belonging to them) / there (a place; "there is") / they're (they are)
Avoid
there (for "their")
Avoid
they're (for "their")
Avoid
their (for "there")
Summary

Correct: their (belonging to them) / there (a place; "there is") / they're (they are) — Avoid: there (for "their") / they're (for "their") / their (for "there"). Their = possessive of they; there = in that place, or the subject of "there is/are"; they're = the contraction of they are.

Part of speech
determiner / adverb / contraction
Source
Merriam-Webster

Why

Merriam-Webster: their is the possessive of they, there points to a place or introduces a clause (there is), and they're is the contraction of they are; all three sound alike, so only the meaning tells them apart.

Examples

  • Their train leaves at nine.
  • They're waiting over there.
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Spelling authority
Merriam-Webster · Oxford English Dictionary / Oxford spelling · SCOWL
Commonly confused and non-standard forms
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