* Prepositions need objects: Prepositions are words like "in," "on," "to," "from," "with," "about," etc. They show the relationship between a noun or pronoun (the object) and something else in the sentence.
* Nouns and pronouns act as objects: The object of a preposition is the noun or pronoun that the preposition is describing.
Examples:
* Correct: "The cat sat on the mat." (Mat is the noun object)
* Correct: "I went to the store." (Store is the noun object)
* Correct: "He gave the book to her." (Her is the pronoun object)
However:
* Prepositional phrases can be more complex: Sometimes the object of a preposition can be a whole phrase, including other prepositions.
* Example: "He sat under the table with his dog." (The whole phrase "the table with his dog" is the object of the preposition "under")
Key takeaway: Prepositions always need an object, and that object is usually a noun or pronoun, but sometimes it can be a more complex phrase.