Answer:
I must always obey to my parents.
I mustn't steal anything from anyone.
Explanation:
<em>hope</em><em> </em><em>this</em><em> </em><em>helps</em><em> </em>
<em>Please</em><em> </em><em>reply</em><em> </em><em> </em>
Adjectives and Adverb phrases relate to prepositional phrases because if you remember what an adjective is, it describes a noun and then an adverb i believe can describe a verb, adjective, and other adverbs. Both adjective and adverb phrases contain prepositions, there fore relating them to prepositional phrases.... I hope this is what you were looking for and answered your question... :)