The Writer's Handbook
An Editing Checklist
Use this checklist as a list of reminders while you are editing your paper.
5. Unclear pronoun reference
All pronouns must clearly refer to definite referents [nouns].
Use it, they, this, that, these, those, and which carefully to prevent confusion.
Unclear:
Einstein was a brilliant mathematician. This is how he was able to explain the universe.
Clear:
Einstein, who was a brilliant mathematician, used his ability with numbers to explain the universe.
Unclear:
Because Senator Martin is less interested in the environment than in economic development, he sometimes neglects it.
Clear:
Because of his interest in economic development, Senator Martin sometimes neglects the environment.