2. did you learnt
3. has taken
5. did you visit
6. have never done
B. 1. c)
2. b)
3. b)
4. a)
5. c)
6. b)
C. Harry hasn't left for his holidays yet.
I have never studied German before.
They haven't finished built the new gymnasium yet.
She has finished her project already because she has worked all the night.
Did you go to the party lats night?
Sasha took her driving test a year ago.
I haven't seen you for ages.
The teacher has just come into the classroom.