Ответ:

1.Kate has just cleaned the window.  

2.Have you ever been to Egypt?  

3.Sandra has never driven a car before.  

4.I haven`t invited anyone to the party yet .  

5.She has only written one letter so far  

6.You have known them for five years.  

7.He hasn`t phoned since Sunday.  

8.Toby has recently bought a dog.