Pronouns

(added 12/18/15)

“He” and “she” are the preferred third-person singular pronouns. When using one of these could be interpreted as sexist language or is otherwise awkward, try changing the subject and verb to plural.
singular: When you interview your contractor, ask him for references that include projects in your budget range.
plural: When you interview contractors, ask them for references that include projects in your budget range.

BHG/BHG-SIP style exception:
Sometimes, though, the plural construction won’t work.
singular:  Tell your doctor if you experience side effects so he can help you choose an alternative medication.
plural:  Tell your doctors if you experience side effects so they can help you choose an alternative medication.
singular:  Your child might be having trouble in class because he’s not being challenged.
plural:  Your children might be having trouble in class because they’re not being challenged.

You’re having the conversation with one doctor. We’re talking about one child struggling on school. In cases like this, “they” is acceptable as a third-person singular pronoun.
Tell your doctor if you experience side effects so they can help you choose an alternative medication.
Your child might be having trouble in class because they’re not being challenged.