did

Did is the past tense form of the English verb do. It functions as the finite past tense for all persons and as an auxiliary in forming questions and negations in the simple past, a use sometimes called do-support. Examples include: “Did she go to the store?” and “I did not see him.”

Did can also be a main verb meaning “performed” or “carried out,” as in “She did her homework.” Its past participle is done. The form did originates in Old English and is part of the English verb system that includes irregular forms, with do/did/done serving different grammatical roles.

Emphasis can be added: “I did finish the assignment.” In questions, did is used to place the auxiliary before the subject and main verb in their base forms; in negations, did is followed by not and the base form of the main verb, with contractions such as didn’t common in informal speech.

DID can also refer to Dissociative Identity Disorder, a psychiatric condition characterized by the presence of two or more distinct identities or personality states that control behavior at different times. It is typically associated with a history of severe trauma in early childhood. Diagnosis and treatment involve clinical assessment and psychotherapy, with medications used to address coexisting symptoms rather than the disorder itself.