Okay kiddo, so a patient is a noun, which is a fancy word for a thing, but not just any thing, it's a person who goes to see a doctor or a nurse because they are sick or need some help with their health.
When you write or talk about a patient, you have to be careful about the grammar. That means you have to use the right words and put them in the right order so that people can understand what you're trying to say.
For example, you might say "The patient went to the hospital because they had a fever." The word "the" tells us that we're talking about a specific person, we're not just talking about any patient. The word "had" tells us that the fever is something that the patient already had, not something that they got while they were at the hospital.
Sometimes, if you're talking about patients in general, you might use different words. You might say "Patients often have to wait a long time to see their doctor." In this sentence, we're not talking about any specific patient, we're talking about patients in general.
So, that's the basic idea of what a patient is and how to talk about them correctly. Remember, if you ever have any questions or don't understand something, it's always okay to ask!