Respuesta:
1 I have never tried Octopushing.
2 Have you been switching off the light?
3 My sister has read six novels this month.
4 I’ve been waiting here for my friend to arrive for half
an hour.
5 We’ve already won five matches.
6 I’ve passed six exams.
7 I’ve been at this school for two years.
8 We’ve been walking for ages.
9 They’ve been doing this exam for two hours but they
haven't finished yet.
10 I've known him since summer.
11 Oh no! My phone! I've lost it.
12 I haven’t finished my essay yet.