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.