Какие вредные силы вы знаете?​

a

1. He left quite early but he hasn't arrived yet.

2. We haven't seen each other since we left school.

3. Have you ever written a poem?

4. She has never been to Istanbul.

5. I lent him €50 last week, but he hasn't paid me back yet.

6. I don't see them often but  I've known them for ten years.

7. What year did you leave school?

8. We're lost. We have already been down this road twice.

9. I sent her an email last week, but she hasn't replied yet.

10. They have lived in that house since 1980.

b

1 A How long have you been at university?

  B I started two years ago. I’m in my third year now.

  A Do you live with your parents?

  B I lived with then for the first two years but then I moved into a student hostel last September and I’ve lived there since then.

2. A Has your bother found a job jet?

   B Yes, he’s just started work in a hotel

3. A Have you ever been to Nobu – that new Japanese restaurant?

   B Yes, we went there for my birthday

   A What was it like?

   B The food was fantastic but it cost a fortune!

Объяснение:
Когда мы говорим о действиях в без указания времени совершения действия, то используем Present Perfect. В предложении могут быть слова yet, already, never/ever, just.

А Past Simple употребляется, когда мы называем точное время совершения действия.

Present Perfect употребляется, когда действие продолжается в настоящем или произошло в еще не законченный период времени (в предложении есть слова today, this week/month и т.п.). Past Simple употребляется, когда действие уже закончилось и не имеет связи с настоящим и в предложении есть слова yesterday / last week/ two days ago и др.