1) My grandparents _haven’t joined__ Facebook.
2) We _have posted__ about twenty photos on instagram so far on this trip.
3) I __haven’t written_ a tweet in English.
4) I __haven’t watched_ any of Amy"s music videos on YouTube. Have you?
5) He __has gone_ to pick up his new tablet from the shop in town. He"ll be back later.
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1) Why have I done this? After all, I"m a techno geek.
2) Well, I have spent too much time in the digital world and I 3 haven’t done anything there.
4) there are so many great things I _haven’t done_ ! 5) I _have_ always _wanted_ to skydive, for example.
6) And I _have gone_ to Paris. So that's it: 8) I _have said_ goodbye to technology.