Choose the sentence in which the word "before" is used as a conjunction.
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Верный ответ
- BThink carefully before you answer the question.
Разбор
A conjunction joins clauses, so "before" must introduce a clause with its own subject and verb. In "Think carefully before you answer the question", "before" introduces the clause "you answer the question", so it is a conjunction. In "Never before had she felt so exhausted", "before" modifies the verb and means "at any earlier time", so it is an adverb. In "Before leaving the office, he locked all the drawers", "before" is followed by the gerund phrase "leaving the office", which has no subject of its own, so it is a preposition. In "He had never seen the sea before that summer", "before" is followed by the noun phrase "that summer", so it is also a preposition.