The document discusses the uses of present perfect tense in English. It can be used to describe an action that began in the past and continues in the present, an indefinite past action with results or relevance in the present, or a recent past action with present consequences. Examples are provided for affirmative, negative and interrogative forms using auxiliary verbs like have/has with the past participle. Time expressions like for, since, ever, never, just, already and yet are also discussed.

1. Don’t compare to Portuguese. It’s different !