A proper noun is a noun that identifies a single entity and is used to refer to that entity, such as London, Jupiter, Sarah, or Microsoft, as distinguished from a common noun, which is a noun that refers to a class of entities and may be used when referring to instances of a specific class.
Could you give answer choices, that would assist me better when helping you.
Need more context. Where is this character from?
The subject of this sentence is "You." In English, this is considered to be an understood or inferred subject. These are generally found in imperative sentences, or a sentence that gives a command.