* It's a participle, meaning it's a verb form acting as an adjective. Participles usually need a noun or pronoun to modify, making them dependent on the rest of the sentence.
* It's usually used to modify a noun, indicating a companion or something that goes along with something else.
Here's how you might use "accompanied" correctly:
* "He was accompanied by his dog." ("accompanied" modifies "he")
* "The singer was accompanied by a full orchestra." ("accompanied" modifies "singer")
To start a sentence, you could use a related verb form like:
* "Accompanying him was his dog."
* "Accompanied by a full orchestra, the singer performed."
Let me know if you have any other questions!