2. transform the sentences and use either present perfect simple or present perfect continuous. 1. she has walked 10 km. – 3 hours). 2. i have been talking to ann on the phone since 2 o’clock. – (just). 3. nick has learned this poem by heart! – (all morning)! 4. mummy has been cooking for 2 hours. – (yet)

1. She has walked 10 km. – She has been walking for 3 hours.  

2. I have been talking to Ann on the phone since 2 o’clock. – I have just talked to Ann on the phone.  

3. Nick has learned this poem by heart! – Nick has been learning this poem by heart all morning!  

4. Mummy has been cooking for 2 hours. – She hasn't finished cooking yet. (yet в основном употребляется в отрицательных и вопросительных предложениях)