Answer:
I would say infinitive.
Explanation:
One way to describe the subject of a sentence is to use an article.
What is article?An article is a term that is placed before a noun in English grammar to denote whether the noun is specific or nonspecific. There are two different kinds of articles: definite and indefinite.
Articles are an important aspect of English grammar because they help to clarify the meaning of a sentence and indicate the speaker's intended meaning.
Before nouns, articles are used to denote the noun's identity and whether it is particular or general.
In contrast to "a cat," which can refer to any cat, "the cat" is specific and refers to a specific cat.
Prepositions are used to indicate the relationship between nouns and other sentence parts, whereas infinitives and gerunds are verb forms that serve as nouns or modifiers in a sentence.
Thus, the answer is article.
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