Explanation: Here’s why: Subject-Verb Agreement: The subject here is "I," which is a first-person singular pronoun. Verb Form: The sentence is in the present tense, and the verb "love" should be used to agree with the subject "I." Correct Usage: "Love" is the appropriate base form of the verb to express affection or enjoyment for something. Therefore, the correct sentence is: "I work twelve hours a day, but I love my job."

Explanation: Here’s why: Contractions and Verb Usage: "Isn’t" is a contraction of "is not." In this sentence, you need a negative form of the verb "to be" (is) to indicate that the classmate is not present in class. Subject-Verb Agreement: The subject here is "My classmate," which is a third-person singular noun. Therefore, you need to use the third-person singular form of the verb "to be," which is "is" in the negative form. Correct Structure: The sentence needs to contrast where the classmate is (library) with where she is not (class). "Isn’t" fits perfectly here to express the absence in class. Therefore, the correct sentence is: "My classmate isn’t in class right now, she’s in the library.

Explanation: Here’s why: Subject-Verb Agreement: The subject here is "My friends," which is a plural noun. Verb Form: The sentence indicates that the friends are busy, so you need a plural form of the verb "to be" in the present tense to agree with "My friends." Correct Usage: "Aren’t" is the contraction of "are not," which is the correct negative form of "are" (the plural form of "to be") in this context. Therefore, the correct sentence is: "My friends aren’t busy because they are on holiday."

Explanation: Here’s the explanation: Verb Form: The phrase "like to" is used to express activities that someone enjoys or prefers doing. In this context, "like to" is followed by the infinitive forms of verbs ("swim," "jog," "play") to indicate what activities "we" enjoy or choose to do. Sentence Structure: The sentence is about activities that "we" do in order to stay strong and healthy. Using "like to" indicates a preference or enjoyment of these activities. Therefore, the complete sentence should be: "We like to swim, jog, and play sports to stay strong and healthy."

Explanation: Here’s why: Subject-Verb Agreement: The subject "My family and I" is a compound subject that is treated as plural. Therefore, it requires the plural form of the verb. Present Perfect Tense: The phrase "to many different countries around the world" suggests an action that has happened at various times in the past up to the present. The present perfect tense ("have flown") is appropriate for this context. Correct Verb Form: "Have flown" is the correct present perfect form of the verb "to fly" for plural subjects. Therefore, the correct sentence is: "My family and I have flown to many different countries around the world."

Explanation: Here’s why: Question Formation: The question asks if "you" (the subject) have finished your lunch. For forming questions in the present perfect tense with "you," the auxiliary verb "have" is used. Present Perfect Tense: The present perfect tense is formed with "have" (for plural subjects and the pronoun "you") and the past participle of the main verb ("finished"). Consistent Verb Use: In the response, the auxiliary verb "have" is used to indicate that the action is complete. The short answer to the question "Have you finished your lunch yet?" is "Yes, I have." Therefore, the correct exchange is: (A) "Have you finished your lunch yet?" (B) "Yes, I have."