Iknow the right answers but I cannot explain why they are right. Please help using the indicator of what to look for.
Pronoun-antecedent agreement
12a. When a driver wants to buy a new vehicle, he or she usually test drives them.
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12b. When a driver wants to buy a new vehicle, he or she usually test drives it.
Pronoun-antecedent agreement
13a. Most presenters spoke without looking at his or her notes.
13b. Most presenters spoke without looking at their notes.
Pronoun-antecedent agreement
14a. You may rent a movie or a video game for just one night if they are new.
14b. You may rent a movie or a video game for just one night if it is new.
Pronoun-antecedent agreement with indefinite pronouns
15a. Neither the mayor nor the council members have filed their reports.
15b. Neither the mayor nor the council members have filed his reports.
Pronoun-antecedent agreement with indefinite pronouns
16a. Anyone who requests a copy of the game may have it for their video library.
16b. Anyone who requests a copy of the game may have it for his or her video library.
Pronoun-antecedent agreement with indefinite pronouns
17a. Each of the applicants must submit his or her completed form to the interviewer.
17b. Each of the applicants must submit their completed forms to the interviewer.
Pronoun case
18a. My brother knows more about technology than me.
18b. My brother knows more about technology than I.
Pronoun case
19a. Please send an invitation to Bob and she.
19b. Please send an invitation to Bob and her.
Pronoun case
20a. My best friend and I are going to Hawaii this summer.
20b. My best friend and me are going to Hawaii this summer.
Pronoun case for who and whom
21a. Who was the star of last year’s award-winning movie?
21b. Whom was the star of last year’s award-winning movie?
Pronoun case for who and whom
22a. To who should we send the letter of commendation?
22b. To whom should we send the letter of commendation?
Pronoun case for who and whom
23a. Jon Bon Jovi, who is a well-known singer and actor, also owns an arena football team.
23b. Jon Bon Jovi, whom is a well-known singer and actor, also owns an arena football team.
Vague pronouns
24a. When the car hit a tree, it made a terrible noise.
24b. The car made a terrible noise as it crashed into a tree.
Vague pronouns
25a. Air pollution normally increases along with population growth. This increasing pollution is a big problem for many cities.
25b. Air pollution normally increases along with population growth. This is a big problem for many cities.
Pronoun-antecedent agreement:
12a. The correct answer is 12b. When you see a pronoun (he or she) referring to multiple nouns (a driver wants to buy a new vehicle), you need to use a singular pronoun (it) to maintain agreement.
13a. The correct answer is 13b. "Most presenters" is plural, so you need a plural pronoun (their) to maintain agreement.
14a. The correct answer is 14b. The indefinite pronoun "movie or video game" is singular, so you need a singular pronoun (it) to maintain agreement.
15a. The correct answer is 15b. "Neither the mayor" is singular, so you need a singular pronoun (his) to maintain agreement.
16a. The correct answer is 16b. "Anyone" is singular, so you need a singular pronoun (his or her) to maintain agreement.
17a. The correct answer is 17b. "Each" is singular, so you need a singular pronoun (their) to maintain agreement.
Pronoun case:
18a. The correct answer is 18b. "Than" is a preposition that requires the pronoun in the subjective case (I).
19a. The correct answer is 19b. "Bob and she" is the object of the preposition "to," so you need the objective case pronoun (her).
20a. The correct answer is 20b. "My best friend and me" is the subject of the sentence, so you need the subjective case pronoun (I).
Pronoun case for who and whom:
21a. The correct answer is 21a. "Who" is used as the subject of the sentence, so it is the correct pronoun.
22a. The correct answer is 22b. "Whom" is used as the object of the preposition "to," so it is the correct pronoun.
23a. The correct answer is 23a. "Who" is used as the subject of the relative clause, so it is the correct pronoun.
Vague pronouns:
24a. The correct answer is 24b. The pronoun "it" is vague and does not clearly refer to anything. To make the sentence clearer, use "The car" instead.
25a. The correct answer is 25b. The pronoun "this" is vague and does not clearly refer to "air pollution." To make the sentence clearer, use "This increasing pollution" instead.