A feature of the English language that many Brazilian students find hard to use is the Present Perfect Tense – students usually grasp the concept: it uses the auxiliary HAVE or HAS and the main verb in the PAST PARTICIPLE. In Brazilian Portuguese, this tense can be used but most of the time we use either the simple past or the simple present to refer to a situation. Examples: Faz tempo que ele mora aqui. “He’s lived here for a long time”. Ele saiu agorinha mesmo. “He’s just left.” So, in order to get them used to the new tense I have them practice it in Affirmative, Interrogative and Negative Sentences Example: I have been a teacher since 1986. Have I been a teacher since 1971? I haven’t been a teacher since 1971. Usually the students grasp the idea of duration – since 1989 / for 26 years, etc. Something that started in the past and comes to the present. Something that’s not over yet, or that’s been finished recently. Let’s say that’s the basic usage of the Present Perfect. So we explain that usually with key words like since, for, yet, Present Perfect will be used. Is it a prescription? Yes. Does it work? Theoretically, yes. The students do the exercises fine. But when they’re in open conversation they drop these pearls: “I didn’t have a vacation, yet” or “I didn’t went to Poland, yet”. Bear in mind I’m talking about Advanced Students. Despite the bad rep grammar drills have nowadays, until someone comes up with a US$ 30,000 language pill, there will always be the necessity to practice until your Present is Perfect.