Shift in number is using both a singular and plural pronoun to refer to the same person or group.
When people get special training, he or she should share what they have learned with their coworkers.
(The sentence shifts from the single pronouns he or she to the plural pronoun they.)
When people get special training, they should share what they have learned with their coworkers.
(The sentence now contains the plural forms people and they.)
(From Write for Business, 2nd edition, page 326, and Proofreader's Guide PDF, page 76)
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