how can we use study for the third person singular
The singular demonstrative pronouns are this and that.The plural demonstrative pronouns are these and those.
The singular form of "have" is "has." It is used with third-person singular subjects, such as "he," "she," or "it." For example, you would say, "She has a book."
he wrote a book of studies
"Book" can be both singular and plural. When referring to one book, it is singular. When referring to more than one book, it is plural.
Georgius Agricola wrote a book of studies to further the study of geology.
Georgius Agricola wrote a book of studies to further the study of geology.
Georgius Agricola wrote a book of studies to further the study of geology.
A singular noun or a singular noun phrase usually follows "this" or "that." For example, "this book" or "that car."
Two singular objects added together are plural, so, the book and pen are in the desk.
The rule for using "have" and "has" is based on the subject of the sentence. "Have" is used with the pronouns I, you, we, and they, as well as plural nouns. "Has" is used with the third-person singular pronouns he, she, it, and singular nouns. For example, "I have a book," but "She has a book."
The word "person's" is a singular possessive form. It indicates ownership or association with a single person. For example, in the sentence "This is John's book," "John's" is the singular possessive form indicating that the book belongs to John. If you were referring to the possessive form for multiple people, the correct form would be "people's." For example, "This is the people's choice."
noun that are plural in form but singular in meaning