Ағылшын тілі пәнінен № 2832 тапсырма: Articles, prepositions, conjunctions. Word-formation

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An adverb stands alone and modifies the verb, with no noun phrase or clause after it. In "He left town and has not called since." the word since means "from that time until now" and has nothing after it, so it is an adverb. In "They have lived here since 2015." it is followed by the noun phrase 2015, so it is a preposition. In "Since it was raining, we stayed home." it introduces a clause of reason, so it is a conjunction. In "It is a year since I last saw her." it introduces the clause I last saw her, so it is a conjunction of time.