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.” 

"John and I" is incorrect because this first person pronoun needs to be in objective case, "me." It is the object of the preposition "above" and is not the subject of the sentence; therefore, the objective case "John and me" is correct over subjective case "I."

This sentence uses the wrong case of pronoun. As an object, the first person pronoun should always be “me.” The corrected sentence reads, "There was a new person who I had never seen before standing between my sister and me in the line."

In this sentence, the pronoun “their” does not agree in number with its antecedent “the grizzly bear.” The corrected sentence reads: The grizzly bear, a species well-known for its aggressive behavior, has a bite so strong it could crush a bowling ball.