Question

English - rfvv today at 4:53pm
What is the part of speech in each sentence? Is my explanation right?

1. This book is for you.
['For you' is an adverb phrase.]

2. The gift for you is a book.
['For you' is an "adjective" phrase.]

3. I bought this book for you.
['For you' is an adverb phrase.]

4. This book for you is very good.
['For you' is an "adjective" phrase.]



You are referring to each prepositional phrase's usage, not the part of speech.

Sentence 1 --
This = pronoun
book = noun
is = verb
for = preposition
you = pronoun

A prepositional phrase is comprised of a preposition plus its object (which can be either a noun or a pronoun). There is often an article and/or adjective between the preposition and its object.

Please revise your original statement. You're not referring to parts of speech here, but to the use of prepositional phrases: adjectival or adverbial.
======================================
Thank you for your help. I will post again.
"For you" is a prepositional phrase. It can be an adverbial phrase and an adjective phrase. Is my explanation correct? Especially, what about #1?

1. This book is for you.
['For you' is an adverb phrase.]

2. The gift for you is a book.
['For you' is an "adjective" phrase.]

3. I bought this book for you.
['For you' is an adverb phrase.]

4. This book for you is very good.
['For you' is an "adjective" phrase.]

Answer 1

I would change one word in your explanation:
<i>"For you" is a prepositional phrase. It can be an adverbial phrase or an adjective phrase. </i>

And yes, I agree with your explanations of #s 1-4.