Here's why:
* Adverbs describe actions: "Also" tells us that something is *in addition to* something else. It modifies the verb by providing extra information about the action being performed.
* Nouns are things: Nouns name people, places, things, or ideas. They don't usually need an adverb to explain how they exist.
Examples:
* Incorrect: "He walked also the dog."
* Correct: "He walked the dog also." (The adverb "also" modifies the verb "walked.")
* Correct: "He also walked the dog." (The adverb "also" modifies the verb "walked.")
Let me know if you'd like more examples or have another question!