"Diana and I" are the objects of the preposition "to" and therefore must be in the objective case. "I" is in subjective case; the correct form of the first person pronoun here would be "me." "The teacher awarded extra credit to only Diana and me..."

There is no error in this sentence. The semicolon is appropriate, as the two clauses are both independent and there is no conjunction linking them. There is no preposition case error ("me" is correct because it is the object of the preposition "between"). The pronoun should be in objective case, which it is.

The first person pronoun here should be in subjective case, "I," as opposed to objective case, "me." 

A quick and easy way to test this is to simplify it as much as possible. Temporarily remove other nouns from this part of the sentence - would "where me was waiting" sound correct? No, so "me and Alicia" wouldn't be right either. "Where I was waiting" sounds fine, and it is - "Alicia and I" would be the correct replacement.

The preposition, in this case "between," must be followed by an indirect object pronoun, not the direct object pronoun "I." The correct version of this sentence would read: "The animosity between Bob and me..."

A quick test for pronoun case is to invert the order; one would never say "the animosity between I and Bob..."

The pronoun should be in objective case because it is the object of the preposition "to." "I" is in subjective case and should be switched to "me."

You can simplify the Noun Phrase to make this less complicated. "To I" wouldn't be correct, so extend that - "To Tony and I" shouldn't be correct, either. "To me" sounds good, as does "To Tony and me."

This sentence has an error in pronoun case. Pronouns are words that substitute for nouns and case describes the pronoun's role in a sentence. "Me" and "I" are both pronouns but they have different cases: "me" is used as the object in a sentence and "I" is used as the subject. In this sentence, "your grandfather and ___" is the object of the verb "talking," so "me" should be used instead of "I." A corrected sentence reads, "Whenever Suzie goes to visit her grandparents in the nursing home, her grandmother reminds her, 'Speak up when you are talking to your grandfather or me!'" 

The sentence above contains a pronoun case error. The "her" in the second part of the sentence should be "she" as the pronoun is the subject of that clause, rather than an object. The best way to correct the sentence above is:

"Marlene loves to go on long walks along the beach; she is definitely your type."

The sentence above contains a pronoun case error. The "us" in the second quotation of the sentence should be "we" as the pronoun is the subject of that clause, rather than its object. The best way to correct the sentence above is:

'"The people of this valley don't take kindly to strangers," said the Mayor. "We folks like to keep to ourselves."'

The sentence above contains a pronoun case error. The "I" in the second part of the sentence should be "me" as the pronoun is the object of that clause, rather than its subject. The best way to correct the sentence above is:

"That dog was a noble beast; she was extremely loyal to my brother and me."

"SUVs," the subject of this sentence, is the plural form of SUV. Since we are dealing with a plural, it is incorrect to use the singular pronoun “it” at the beginning of the sentence. Rather, the plural form of the pronoun “they” must be used instead so that the sentence begins, “While they continue.”