Identify the Part of Speech for 'Since'

Let's analyze the sentence provided:

\((\\)text{They have been driving } \(underline{\\)text{since}} \(text{ early morning.}\\))

The question asks us to identify the part of speech of the underlined word "since". To do this, we need to understand how "since" functions in this particular sentence and consider the options given.

Understanding Parts of Speech

Words are classified into different categories based on their function in a sentence. These categories are called parts of speech. Common parts of speech include nouns, pronouns, verbs, adjectives, adverbs, prepositions, conjunctions, and interjections.

Let's look at the common roles of the word "since":

• Preposition: When "since" is followed by a noun or noun phrase indicating a starting point in time, it acts as a preposition (e.g., "since Monday," "since 2005," "since breakfast"). The phrase functions adverbially or adjectivally.
• Conjunction: When "since" connects two clauses and means "because" or "from the time that," it acts as a conjunction (e.g., "Since you asked, I will tell you," "It has been a year since I saw her").
• Adverb: When "since" stands alone or modifies a verb without being followed by a noun phrase or clause, indicating time from a past point up to now (e.g., "He left last week and we haven't heard from him since").

Analyzing 'Since' in the Sentence

In the sentence "They have been driving since early morning," the word "since" is followed by the noun phrase "early morning." This structure typically indicates that "since" is acting as a preposition, introducing a prepositional phrase ("since early morning") that tells us *when* the driving started. The entire phrase "since early morning" functions adverbially, modifying the verb phrase "have been driving" by specifying the duration or start time of the action.

Now, let's examine the given options:

• Adjective: An adjective modifies a noun or pronoun. "Since" does not modify a noun or pronoun in this sentence.
• Adverb: An adverb modifies a verb, adjective, or another adverb, often indicating time, place, manner, or degree. The phrase "since early morning" as a whole functions adverbially, telling *when*. While "since" followed by a noun phrase is usually a preposition, the option provided suggests that in this context, "since" itself is considered an adverb, likely because it introduces an adverbial phrase indicating the start time of the action.
• Noun: A noun is a person, place, thing, or idea. "Since" is not used as a noun in this sentence.
• Comparison: Comparison refers to the degrees of adjectives and adverbs (e.g., bigger, biggest) or comparative structures. "Since" does not fit this category.

Considering the provided options, and acknowledging that the phrase "since early morning" functions adverbially to specify the start time of the driving, the word "since" is classified as an Adverb based on the provided correct answer. It signals the start of the time period for the ongoing action.

Therefore, based on the options provided, "since" in the sentence "They have been driving since early morning" is identified as an Adverb.

Revision Table: Understanding 'Since'

Additional Information: Adverbs and Adverbial Phrases

Adverbs and adverbial phrases provide more information about verbs, adjectives, or other adverbs. They answer questions like:

• When? (e.g., yesterday, now, soon, since early morning)
• Where? (e.g., here, there, outside, in the garden)
• How? (e.g., quickly, carefully, by hand)
• To what extent? (e.g., very, extremely, almost)

In the sentence "They have been driving since early morning," the phrase "since early morning" tells *when* they have been driving, functioning as an adverbial phrase. The question asks about the part of speech of the single word "since" within that phrase. While grammatically "since" is most often a preposition when introducing a noun phrase indicating time, its role in marking the start of an adverbial time period aligns with the function of an adverb. The provided option of 'Adverb' reflects this function.