помогите сделать из Present Perfect в Past perfect
Read the sentences and recollect now the present perfect continuous tense is used: 1. It has been raining for 3 hours already. 2. It is 12 o'clock. Bob has been working since 9 o'clock. It's time to have a break! 3. We have been living in Almaty since 1999. 4. Robert has been playing the piano so well since he began to train regularly. 5. Why are you so hot? - I have been running all the way. 6. What's the mstter with you? - I've got a headache. I've been writing Christmas postcards since early morning. 7. I have been waiting for you at the Museum for an hour!