a) The farmer is planting trees for two months now.
The farmer isn't planting trees for two months now.
Is the farmer planting trees for two months now?
b) Anna is sleeping since this morning.
Anna isn't sleeping since this morning.
Is Anna sleeping since this morning?
c) Peter is teaching for seven years now.
Peter isn't teaching for seven years now.
Is Peter teaching for seven years now?
d) Sheila is swimming for hours now.
Sheila isn't swimming for hours now.
Is Sheila swimming for hours now?
e) They are hoping for his returning since last week.
They aren't hoping for his returning since last week.
Are they hoping for his returning since last week?
f) I am waiting for twenty minutes.
I'm not waiting for twenty minutes.
Am I waiting for twenty minutes?
g) They are going out together since last June.
They aren't going out together since last June.
Aren't they going out together since last June?
h) We are doing some exercises.
We aren't doing some exercises.
Are we doing some exercises?
i) I am waiting for ages.
I'm not waiting for ages.
Am I waiting for ages?
j) Robert is learning English for eight years.
Robert isn't learning English for eight years.
Is Robert learning English for eight years?
k) You are sitting on my new jeans.
You aren't sitting on my new jeans.
Are you sitting on my new jeans?
l) Sue and Jeff are cutting the cake.
Sue and Jeff aren't cutting the cake.
Are Sue and Jeff cutting the cake?
m) The democracy is beginning.
The democracy isn't beginning.
Is the democracy beginning?
n) The policeman is controlling the traffic.
The policeman isn't controlling the traffic.
Is the policeman controlling the traffic?
o) The sheriff is arresting the bandits.
The sheriff isn't arresting the bandits.
Is the sheriff arresting the bandits?
