Since Professor Clarke is speaking to both Daisy and Margaret, the pronoun "she" is used incorrectly here—whom is "she" referring to? "She" should be changed to "they" to reflect that both women are being spoken to by Professor Clarke.

Because Paul and Tom are a unified unit, they become a group of more than one. As such, the plural pronoun "they" should be used to refer to them, meaning that "he" in the sentence is incorrect.

The correct version of this sentence would read: "Paul and Tom had a great time working together; they make a good team."

Although there is a "nor" separating Paula and Mark, they are still being treated as a single, plural unit in the second clause. Therefore, the sentence is correct as written. "They" and "their" correspond to the plural antecedent group of "Paula and Mark."

In this example, "The House of Representatives" acts as a collective, singular noun. Therefore, the correct corresponding pronoun is "its", not "their". A common confusion occurs between "its" and "it's". Its is used to indicate the noun being discussed is in possession of something, while "it's" is a contraction of "it is."

The correct version of this sentence would read: "The House of Representatives rarely seems to be able to fulfill its duty these days."

There is no error in the sentence as written. Note that the pronoun "your" corresponds to "you," which is proper and correct. "He's", in this instance, functions as a contraction of "he is." The two clauses are correctly connected with the coordinating conjunction "because."

"You and I" is a collective plural; a first person set of nouns acting as a single entity. Therefore, the correct pronoun to use in conjunction with "you and I" is "our."

The correct version of this sentence would read: "I think it is time for you and I to go our separate ways."

Similarly to "everyone," the noun "person" is singular. Therefore, one must use "his" or "her" as its corresponding pronoun, in lieu of "their", which is plural. Also, the use of "a" prior to a noun will signal a singular noun. A coordinating conjunction, "but", is correctly used with a comma to connect the two clauses of the sentence.

"Them" is incorrect in this sentence. In the second clause "mosquitoes" are the subject. As such, the correct word to use is "they."

The correct version of this sentence would read: "I hate dealing with mosquitoes; they really ruin summer for me."

The word "those" is the antecedent of the pronoun used in the first part of the sentence. The best pronoun to correspond with this antecedent in this case is "their," (plural) rather than "his or her." (singular)

The correct version of this sentence would read: "Those that take action into their own hands, often find that life works out in their favor."

In this sentence, it is obvious that the author's intent is to convey the fact that Sulla was good at making soldiers listen to him. As such, the final "them" of the sentence as written should be replaced with the pronoun "him", which corresponds correctly with Lucius Sulla (who is one, singular person).