A part of speech which stands for a noun: "he", "she", "him", "her", "them". Possessive pronouns express ownership ("his", "hers"). Reflexive pronouns are "herself", "himself", "myself" and are used either for emphasis (he did it all "himself"), or when an action reflects back on the agent who performs it ("he shot himself in the foot"). Relative pronouns include "who", "which", "that" and are usually used in the form 'he rebuked the reader who had sung in the library'. Interrogative pronouns ask questions ("Who stole the apple?"; "Which apple?"). Indefinite pronouns do not specify a particular person or thing: "Anyone who studies grammar must be mad." "Somebody has to know about this stuff."