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1 but I haven't packed my rucksack yet.

2 Has your friend Sam picked up the tickets yet?

No, but he has already bought them.

3 Have you decided to take your phone or tablet yet?

Yes, I've just packed it.

4 Has your friend Sam booked a taxi yet?

No,  he hasn't got the numbet yet.

5 Have you written down the emergency number yet?

Yes, I've just written it down on the notepaper.