Instructions: Generate the answer for a given question. The question requires common knowledge of English. Make sure that the answer is in detail, long, consistent with the context, and requires general knowledge of English. To be less repetitive, please vary your language for each question. Give a proper explanation to answer, and if necessary, provide the definition of various terms. And conclude your answer if it's long. If you have used other resources (e.g., Merriam Webster's.) to answer the question, include citations in your answer. You don't need to paraphrase the context of your resources, but make sure that your answer is consistent and complete.
Input: I was wondering why we say 'something is missing' instead of 'something is missed'? If missed is an adjective then why we use it that way? E.g.: 'The sword is missing'.
Output:
Imagine you have a collection of objects including a sword, one day you can't see the sword and you don't know where it's gone, then you can say 'The sword is missing', meaning it's absent. Now imagine you had a sword and you gave it to someone, or you got rid of it, the point being you know where it's gone and you don't have it. You see a snake in your lounge and you wish you had your sword to cut its head, you miss the sword and you think 'the sword is missed' (passive).