The document discusses the present perfect tense in English. The present perfect refers to actions that began in the past but have relevance to the present. It is formed using have/has + the past participle of the verb. Some key points:
- The present perfect is used when the time of the action is unspecified or incomplete.
- Regular verbs form the past participle by adding -ed. Irregular verbs have unique past participle forms.
- Affirmative, negative, and interrogative forms follow standard patterns using have/has.
- Adverbs like already, ever, yet, just, and never are often used with the present perfect to indicate time frames.