Questions 10–16: in the following sentences, identify the antecedent for each pronoun. 10. william asked for his coffee to be brought to the conference room. 11. the music was so loud that it hurt our ears. 12. thomas and christine forgot to bring their umbrellas to work. 13. since grandma helen was ten years old, she had been writing letters. 14. the rain pounded on the roof and it leaked through the cracks. 15. his messenger bag was so full that randy could not fit another file in it. 16. mr. cooper told his students that they were responsible for their grades.

The correct answers are as follows:
10. The antecedent in the sentence is WILLIAM.
11. The antecedent in the sentence is MUSIC.
12. The antecedent here are THOMAS AND CHRISTINE.
13. The antecedent here is GRANDMA HELEN.
14. The antecedent in the sentence is RAIN.
15. The antecedent in the sentence is RANDY.
16. The antecedent in the sentence is MR COOPER.
An antecedent refers to the noun or pronoun, which another pronoun is referring to in a sentence. An antecedent usually precede a  noun or pronoun it refers to in a sentence. There must be an agreement between the pronoun and its antecedent, that is, if the antecedent is singular, then the pronoun also has to be singular.