0 'Have you invited Chris?' 1 'Petra has already hired a costume for the party.'
2 'Has Joey given Dad his birthday present yet?'
3 'We haven't ordered the cake yet.'
4 'Have they ever been to a school prom?'.
5 I've just knocked my drink on the floor!
a 'Haven't you?'
b 'Have you? Don't worry.'
c 'Yes, I have. He's coming with Tina.'
d 'No, not yet; the party isn't until two.'
e 'Has she? I haven't!'
f'No, never.'