Intensive pronouns are pronouns that emphasize a noun or another pronoun in a sentence. They are formed by adding "-self" or "-selves" to certain personal pronouns, such as I, you, he, she, it, we, and they. For example, in the sentence "I myself completed the project," the intensive pronoun "myself" emphasizes the subject "I." These pronouns do not change the meaning of the sentence but add emphasis. They are often used for clarity or to highlight the subject's involvement. Examples include "She herself organized the event" and "They themselves made the decision."