The key issue in the underlined portion of the sentence is the use of the first person pronoun, "I." "I" is the subjective form, but is used as an object in the sentence. Thus, it needs to be changed to the object form "me," making "for me and my brother" the correct answer choice.

The use of both "he" and "I" is absolutely incorrect, as both pronouns are subjective pronouns that should only be used as the subject of the sentence. Both pronouns should be changed to the objective forms. Therefore, the correct answer choice is "to attack me and him."

The underlined introductory phrase features two subjective pronouns, "he" and "I," but an introductory phrase does not contain the subject of the sentence. Both pronouns need to be changed to the appropriate objective pronouns, making "For me and him" the correct answer choice.

The example sentence features a pronoun case error. In the example sentence, the objective case is used incorrectly. (The objective case is used when pronouns are objects of verbs or objects of prepositions.) The example sentence is best rewritten using the subjective case (which is used when the pronoun as a subject).

A quick test of the pronoun case is to rephrase the sentence using the pronoun as subject. You would not, for instance, say "Me was asked to review the proposal." The best version of the sentence is "Raymond and I were asked to review the proposal before the investors' meeting."

The example sentence features a very common error of pronoun case, which leads the sentence to incorrectly conclude with a preposition. Rather than using the subjective-case "who" in saying "who I am speaking to," it is correct to use the objective-case "whom." The correct version of the sentence reads, "I have no clear idea to whom I am speaking."

When trying to determine whether to use who or whom, you can use the following rule: try to substitute “he/him” or “she/her.” If either “he” or “she” sounds correct when substituted, then you need the subjective case of the pronoun, "who," because "he" and "she" are subjective case pronouns. If an objective case pronoun ("him" or "her") sounds correct, you need the objective case pronoun "whom."

It may still seem tricky to determine which pronoun is needed here, as in the sentence as a whole, the pronoun in question appears to be the object of the verb "to choose," but it is the subject of the clause "whoever was the first person to submit his or her resume." In cases such as these, the pronoun case is determined by the role it plays in the clause, not in the entire sentence. This means that in this case, we need "whoever," as the pronoun is the subject of the clause "whoever was the first person to submit his or her resume."

“Believing” would constitute an incorrect gerund usage. “Me” must be changed to “I” because it is the nominative case pronoun.

The first person pronoun in this sentence is the object of the preposition "to," and should therefore be in objective case. "Me" is the appropriate choice instead of "I." To simplify, you can remove Kathy momentarily (sorry, Kathy!) and see how the sentence would sound in a simpler form. "...was assigned to I" doesn't sound right, so "...was assigned to Kathy and I" shouldn't be right, either.

The first person pronoun should be the objective case "me" as opposed to the subjective "I." If we remove "Will" from the sentence and simplify by removing the modifier offset by commas, we get the super-simple: "The manager offered I a half-hearted explanation." This illustrates the benefit of the simplifying tip, which can point out sentence flaws that become shrouded as complexity increases.

The sentence misuses the word "who." "Who" is only used when it is the subject of a clause, but it is acting as the object the clause "everyone liked," so the appropriate choice is "whom." All other punctuation is already correct, so the best choice is, "The new boss, whom everyone liked, made many changes that led to a better working environment."