i don't know what an understood pronoun is

The only understood pronoun is the subject "you" in a command or request. Consider these examples:

Pass the butter, please.
Take out the trah.

In both sentences, we understand that "you" is the subject of the sentneces.

An "understood pronoun" is usually referred to when a sentence is in imperative (command) form.

In the following sentence, there is no WRITTEN SUBJECT:
Open your books to page 51.

The verb is "open" and the rest of the sentence is the direct object and its modifiers. In other words, the whole thing is the complete predicate -- the verb and everything that goes with it. But even though the subject is not stated, do you have any doubts about who is supposed to open their books?

Formally, "you" is the understood pronoun that serves as the unwritten subject of any command. This is the pronoun I think you're referring to, right?

An understood pronoun is when you talk to someone but leave out the word "you", because its obvious that you are talking to them. Example: "You pick that up" could be said as "Pick that up" In the second sentence the "you" is unserstood, so it doesnt need to be said.

An understood pronoun is a type of pronoun that is implied or understood but not explicitly stated in a sentence. It is a common feature in many languages, including English. When using an understood pronoun, the speaker or writer omits the actual pronoun because it is clear from the context who or what is being referred to.

To understand an understood pronoun in a sentence, you need to analyze the context and look for clues to determine the missing pronoun. These clues can be found in the subject or object of the sentence, previous sentences, or the overall topic of the conversation or text.

For example, consider the sentence "She loves to read, and hides her books under the bed." In this case, the understood pronoun is "she," which is omitted from the second part of the sentence. By looking at the context and knowing that the subject of the sentence is a female, we can understand that "she" refers to the same person mentioned in the first part of the sentence.

Understanding understood pronouns requires careful attention to context and the ability to make logical inferences based on the surrounding information.