simple adjective versus prepositional phrases

Question

In English, how do I know when to use a possessive adjective before the noun and when to put that adjective into a prepositional phrase. For example, the library books, the sound of her voice.asi

Answer 1

Hey Songkyol! Great question. :)

This is actually one of those things that native speakers do automatically without thinking, but it definitely confuses a lot of learners!

To answer your question: "the library books" and "the sound of her voice" are actually doing two slightly different things. Here is the easiest way to think about it:

1. The Noun + Noun combo (like "library books")

When you put two nouns together (Library + Books), the first noun acts like an adjective describing the category. You use this when you are talking about a general type of thing.

1. Example: Library books (books that belong to category of "library"), coffee cups, water bottles.
2. Note: It doesn't necessarily mean the books belong to the library; it just tells us what kind of books they are.

2. The Prepositional Phrase (like "the sound of her voice")

You use this when you want to show a specific relationship, origin, or possession - especially with things that aren't physical objects or when you want to be very specific.

1. Example: "The sound of her voice" (You can't really say "her voice sound").
2. Example: "The roof of the house" (You can say, "the house roof," but "the roof of the house" sounds much more natural because a house is a large physical object).

If you want to know when to use a possessive adjective before a noun vs. a prepositional phrase, ask yourself: Is this a permanent trait, or a specific relationship?

1. If it's a general category > Use the noun/adj before: A library book.
2. If it's a specific relationship or something you can't easily squish together > Use "of": The sound of her voice.

Also, a super common rule of thumb: Use 's for people and animals (the girl's voice), use "of" for objects and abstract things (the sound of the wind), and squish words together when making compound nouns (a library book).

Let me know if you want me to give you some more examples to practice with! You have got this!

Answer 2

Her voice sounds beautiful.

His eyes look frightening.

Your cooking smells fabulous!

I each of these examples, there is a noun preceded by a possessive adjective. Each states simply, whose voice, eyes, or cooking we mean.

The sound of her voice Is beautiful.

The look in his eyes is frightening.

The smell of your cooking is fabulous!

In each of the previous 3 examples, the possessive adjective still states whose eyes, voice, or cooking we mean but we have changed the initial verb into a noun. Then the preposition is added to the possessive adjective and noun to create the prepositional phrase.

It could be looked at as a more poetic way of speaking or writing. They both mean the same thing. However, if you don't insert a preposition in each of the second three examples, you do not have a complete thought/sentence. Hope this helps.