Agreement errors; singular objects with plural pronouns. In most cases you should use a singular pronoun if your sentence has a singular subject. Sometimes, however, I do not know the preferred gender of the subject of your sentence or the subject identifies as neither male nor female. In those cases you might rework the sentence to illuminate the need for a singular pronoun or, if that’s not possible results and awkward or unclear writing, you can use they, them or their as a singular, gender neutral pronoun. I hope this helps good luck with your test