Can I please get explanations on the folling questions

Subject-verb agreement
1a. Did you know a famous animal-rights activist has criticized horseracing because of the dangers involved?
1b. Did you know a famous animal-rights activist have criticized horseracing because of the dangers involved?
Subject-verb agreement
2a. Peer editing academic papers require critical-thinking skills and diplomacy.
2b. Peer editing academic papers requires critical-thinking skills and diplomacy.
Subject-verb agreement
3a. Vitamins that are sold in a health-food store are not regulated by the Food and Drug Administration.
3b. Vitamins that are sold in a health-food store is not regulated by the Food and Drug Administration.
Using regular and irregular verbs
4a. John has become a rather good actor.
4b. John has became a rather good actor.
Using regular and irregular verbs
5a. Some athletes have taken drug tests to prove they are not on steroids.
5b. Some athletes have took drug tests to prove they are not on steroids.
Using regular and irregular verbs
6a. I lay my book on the table, but now I cannot find it.
6b. I laid my book on the table, but now I cannot find it.
Using the correct form of be and have in the present tense
7a. I was interested in working on the presidential campaign if the opportunity still exists.
7b. I am interested in working on the presidential campaign if the opportunity still exists.
Verb form and verb tense
8a. Since American Idol premiered on television, many talented contestants have appeared on the show.
8b. Since American Idol premiered on television, many talented contestants appeared on the show.
Verb form and verb tense
9a. The ancient Egyptians built pyramids as burial sites for their leaders.
9b. The ancient Egyptians have built pyramids as burial sites for their leaders.
Identifying antecedents
10a. The antecedent in the following sentence is students: Students in online classes have to be organized to keep up with their assignments.
10b. The antecedent in the following sentence is class: Students in online classes have to be organized to keep up with their assignments.
Identifying antecedents
11a. The antecedent in the following sentence is Doctors: Doctors should schedule more time for patients so they do not spend so much time in the waiting room.
11b. The antecedent in the following sentence is patients: Doctors should schedule more time for patients so they do not spend so much time in the waiting room.
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.

After you have answered these questions -- based upon what you've learned in this class -- we'll be glad to help you.

what is a antecedent

a substantive word, phrase, or clause whose denotation is referred to by a pronoun (as John in “Mary saw John and called to him

Sure! Here are the explanations for each question:

1a. The correct sentence is: "Did you know a famous animal-rights activist has criticized horseracing because of the dangers involved?" In this sentence, the subject "a famous animal-rights activist" is singular, so the verb "has criticized" agrees with it. To determine the subject-verb agreement, you should identify whether the subject is singular or plural and choose the appropriate form of the verb accordingly.

2b. The correct sentence is: "Peer editing academic papers requires critical-thinking skills and diplomacy." In this sentence, the subject "Peer editing academic papers" is singular, so the verb "requires" agrees with it. Again, you should determine the subject-verb agreement by identifying whether the subject is singular or plural and choose the corresponding form of the verb.

3a. The correct sentence is: "Vitamins that are sold in a health-food store are not regulated by the Food and Drug Administration." In this sentence, the subject "Vitamins" is plural, so the verb "are" agrees with it. To ensure subject-verb agreement, you need to identify whether the subject is singular or plural and select the correct form of the verb based on that.

4a. The correct sentence is: "John has become a rather good actor." In this sentence, the verb "has become" is the correct past participle form of the irregular verb "become." When using irregular verbs, you need to use the appropriate form of the verb based on the tense and subject.

5a. The correct sentence is: "Some athletes have taken drug tests to prove they are not on steroids." In this sentence, the verb "have taken" is the correct past participle form of the irregular verb "take." Again, when using irregular verbs, you should use the correct form of the verb based on the tense and subject.

6a. The correct sentence is: "I laid my book on the table, but now I cannot find it." In this sentence, the verb "laid" is the past tense form of the irregular verb "lay." Remember to use the appropriate form of the verb based on the tense and subject when using regular or irregular verbs.

7b. The correct sentence is: "I am interested in working on the presidential campaign if the opportunity still exists." In this sentence, the verb "am interested" is in the present tense and agrees with the subject "I." To ensure subject-verb agreement, you need to use the appropriate form of the verb based on the tense and subject.

8a. The correct sentence is: "Since American Idol premiered on television, many talented contestants have appeared on the show." In this sentence, the verb "have appeared" is the correct past participle form of the irregular verb "appear." Remember to use the appropriate form of the verb based on the tense and subject when using regular or irregular verbs.

9a. The correct sentence is: "The ancient Egyptians built pyramids as burial sites for their leaders." In this sentence, the verb "built" is the past tense form of the irregular verb "build." To ensure subject-verb agreement, choose the correct form of the verb based on the tense and subject.

10a. The correct sentence is: "The antecedent in the following sentence is students: Students in online classes have to be organized to keep up with their assignments." In this sentence, the word "students" is the antecedent because it is the noun that the pronoun "they" refers to. To identify the antecedent of a pronoun, look for the noun that the pronoun replaces or refers to.

11b. The correct sentence is: "The antecedent in the following sentence is patients: Doctors should schedule more time for patients so they do not spend so much time in the waiting room." In this sentence, the word "patients" is the antecedent because it is the noun that the pronoun "they" refers to. To identify the antecedent of a pronoun, look for the noun that the pronoun replaces or refers to.

12b. The correct sentence is: "When a driver wants to buy a new vehicle, he or she usually test drives it." In this sentence, the pronoun "it" agrees in number with the singular noun "vehicle." For pronoun-antecedent agreement, the pronoun should match the number (singular or plural) and gender (masculine, feminine, neutral) of its antecedent.

13b. The correct sentence is: "Most presenters spoke without looking at their notes." In this sentence, the pronoun "their" agrees in number with the plural noun "presenters." For pronoun-antecedent agreement, the pronoun should match the number (singular or plural) and gender (masculine, feminine, neutral) of its antecedent.

14b. The correct sentence is: "You may rent a movie or a video game for just one night if it is new." In this sentence, the pronoun "it" agrees in number with the singular noun "movie" or "video game." For pronoun-antecedent agreement, the pronoun should match the number (singular or plural) and gender (masculine, feminine, neutral) of its antecedent.

15b. The correct sentence is: "Neither the mayor nor the council members have filed their reports." In this sentence, the pronoun "their" agrees in number with the plural noun "council members." For pronoun-antecedent agreement with indefinite pronouns, use plural pronouns to refer to indefinite pronouns like "neither" or "each" when they refer to more than one person or thing.

16b. The correct sentence is: "Anyone who requests a copy of the game may have it for his or her video library." In this sentence, the pronoun "his or her" agrees in number with the singular indefinite pronoun "anyone." For pronoun-antecedent agreement with indefinite pronouns, use singular pronouns to refer to indefinite pronouns like "anyone" or "somebody" when they refer to a single person or thing.

17a. The correct sentence is: "Each of the applicants must submit his or her completed form to the interviewer." In this sentence, the phrase "his or her" agrees in number with the singular noun "each." For pronoun-antecedent agreement with indefinite pronouns, use singular pronouns to refer to indefinite pronouns like "each" or "everybody" when they refer to a single person or thing.

18b. The correct sentence is: "My brother knows more about technology than I." In this sentence, the pronoun "I" is in the correct subjective case and agrees with the subject "my brother." Use subjective pronouns (I, you, he, she, it, we, they) when the pronoun functions as the subject of the sentence.

19b. The correct sentence is: "Please send an invitation to Bob and her." In this sentence, the pronoun "her" is in the correct objective case and agrees with the object of the preposition "to." Use objective pronouns (me, you, him, her, it, us, them) when the pronoun functions as the object of a verb or preposition.

20a. The correct sentence is: "My best friend and I are going to Hawaii this summer." In this sentence, the pronoun "I" is in the correct subjective case and agrees with the subject "my best friend and I." Use subjective pronouns (I, you, he, she, it, we, they) when the pronoun functions as the subject of the sentence.

21a. The correct sentence is: "Who was the star of last year’s award-winning movie?" In this sentence, the interrogative pronoun "Who" is in the subjective case and is used to ask about the subject of the sentence.

22b. The correct sentence is: "To whom should we send the letter of commendation?" In this sentence, the pronoun "whom" is in the objective case and is used as the object of the preposition "to."

23a. The correct sentence is: "Jon Bon Jovi, who is a well-known singer and actor, also owns an arena football team." In this sentence, the pronoun "who" is in the subjective case and is used to introduce a relative clause that provides additional information about Jon Bon Jovi.

24b. The correct sentence is: "The car made a terrible noise as it crashed into a tree." In this sentence, the pronoun "it" refers back to the noun "car," making the sentence clearer and more specific by providing a direct subject for the verb "crashed."

25b. The correct sentence is: "Air pollution normally increases along with population growth. This is a big problem for many cities." In this sentence, the pronoun "This" refers back to the noun "Air pollution" and clarifies what the problem is, making the sentence more coherent and precise.