Page 778 - Wordsmith A Guide to College Writing

their. The following section shows several ways to correct pronoun
agreement errors such as this one while remaining gender-fair.

Solution 1:

Choose a gender and stay with it throughout a single example or

paragraph. Then, in your next example or paragraph, switch to the

other gender.

singular plural
Nobody has received their grades from the last term yet.

singular singular
Nobody has received his grades from the last term yet.

singular singular

Nobody has received her grades from the last term yet.

Solution 2:

Use a “his or her” construction. Because this solution is grammatically

correct but stylistically awkward, use it in situations where you will not

have to repeat the construction.

singular plural
Nobody has received their grades from the last term yet.