The sentence 'Either Sarah or Molly will have to bring their flashlight' does not show correct pronoun agreement.
Either Sarah or Molly will have to bring their flashlight shows incorrect pronoun agreement. In this case, 'Either Sarah or Molly' is singular, so the pronoun 'their' should be 'her' to maintain agreement.
Correct: Either Sarah or Molly will have to bring her flashlight.
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