Soluzione del esercizio 1 di Performer B1, Vol. 1

Esercizi svolti per il libro Performer B1, Vol. 1

Soluzione

  1. The present perfect is composed of two elements: (B) the present tense of have + the past participle of the main verb.
  2. We use the present perfect for actions that happened (B) at an unspecified time.
  3. We also use the present perfect to talk about actions that happened (A) within the last few moments.
  4. (A) Ever, never, just, already and yet are signal words of the present perfect.
  5. Yes is used in (B) interrogative and negative sentences.
  6. We use have/has been to to refer to someone who (B) went to a place and has already returned.
  7. After It's the first time we use (B) the present perfect.
  8. We use must for (A) a self-imposed necessity or obligation, written instructions and orders.
  9. Mustn't expresses (B) prohibition.
  10. We use needn't to express (A) absence of obligation to do something.