Which sentence uses the past perfect tense correctly?

Correct Answer: A

Rationale: Option A correctly uses the past perfect tense to show an action that was completed before another past action. In this sentence, 'the party had already begun' indicates that the party started before 'I arrived.' This structure is typical of the past perfect tense. Choice B uses the past perfect tense but does not demonstrate the sequence of actions in the past. Choice C uses the future perfect tense, indicating completion of an action by a future time. Choice D uses the past perfect continuous tense, not the simple past perfect tense required by the question.

Correct Answer: B

Rationale: Option B is the correct answer as it uses the gerund (-ing) form for all three hobbies, achieving parallel structure. Parallel structure requires that elements in a sentence are grammatically balanced. In this case, all three activities are presented in the same form, making the sentence clear and consistent. Choices A, C, and D do not exhibit parallel structure as they mix verb forms or use infinitives, breaking the parallelism needed for correct grammar.

Correct Answer: B

Rationale: The word 'ambiguous' implies having multiple interpretations or uncertainty, which aligns closely with 'vague,' the correct answer. 'Vague' denotes a lack of clarity or definiteness, making it the most appropriate synonym in this context. 'Precise' (Choice A) is the opposite of ambiguous, indicating exactness and clarity, so it is not the best choice. 'Definite' (Choice C) also contrasts with ambiguous as it suggests clear and certain meaning. 'Straightforward' (Choice D) implies directness and simplicity, which does not capture the essence of ambiguity.

Correct Answer: B

Rationale: The modal verb 'should' is used to imply an intention or expectation in the present or near future. Option B, 'I should be going now,' correctly conveys such a meaning, indicating the speaker's intention to leave at the current moment. Choices A, C, and D refer to past actions or future arrivals, which do not align with the appropriate usage of 'should' in this context. Therefore, option B is the only sentence that uses the modal verb 'should' correctly.

Correct Answer: B

Rationale: The correct answer is B, 'that I wouldn't live life to the fullest.' This clause functions as the object of the verb 'is,' making it a noun clause. Noun clauses act as nouns within a sentence, often functioning as subjects, objects, or complements. Choice A ('My biggest fear') is a noun phrase, not a clause. Choice C ('life') and Choice D ('the fullest') are singular nouns and not clauses.