Can anyone help me with providing an expalnation for each correct answer?

Pronoun-antecedent agreement with indefinite pronouns A
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 B
18a. My brother knows more about technology than me.
18b. My brother knows more about technology than I.
Pronoun case B
19a. Please send an invitation to Bob and she.
19b. Please send an invitation to Bob and her.
Pronoun case A
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 A
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 B
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 A
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.

3 answers

17... Each is singular; therefore the pronoun must be singular.

18. "than I (know)" is an adverb clause. I is the subject of the clause; therefore must be in the nominative case.

19. "to her"is a prepositional phrase. Her is the object of the preposition; therefore must be in the objective case.

20. "I" is the subject of the sentence; therefore must be in the nominative case.

21. "Who" is the subject, therefore nominative case.

22. "to whom" is a prepositional phrase, therefore the object is in the objective case.

23. "who is a well-known singer" is a clause. "who" is the subject; therefore must be in the nominative case.
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