I'd be snowploughing you'd be snowploughing he'd be snowploughing we'd be snowploughing you'd be snowploughing they'd be snowploughing
Perfect
I should've snowploughed you should've snowploughed he should've snowploughed we should've snowploughed you should've snowploughed they should've snowploughed
V-ing perfect
I should've been snowploughing you should've been snowploughing he should've been snowploughing we should've been snowploughing you should've been snowploughing they should've been snowploughing
Negation
Simple form
I shouldn't snowplough you shouldn't snowplough he shouldn't snowplough we shouldn't snowplough you shouldn't snowplough they shouldn't snowplough
V-ing form
I shouldn't be snowploughing you shouldn't be snowploughing he shouldn't be snowploughing we shouldn't be snowploughing you shouldn't be snowploughing they shouldn't be snowploughing
Perfect
I shouldn't have snowploughed you shouldn't have snowploughed he shouldn't have snowploughed we shouldn't have snowploughed you shouldn't have snowploughed they shouldn't have snowploughed
V-ing perfect
I shouldn't have been snowploughing you shouldn't have been snowploughing he shouldn't have been snowploughing we shouldn't have been snowploughing you shouldn't have been snowploughing they shouldn't have been snowploughing
Interrogative form
Simple form
should I snowplough? should you snowplough? should he snowplough? should we snowplough? should you snowplough? should they snowplough?
V-ing form
should I be snowploughing? should you be snowploughing? should he be snowploughing? should we be snowploughing? should you be snowploughing? should they be snowploughing?
Perfect
should I have snowploughed? should you have snowploughed? should he have snowploughed? should we have snowploughed? should you have snowploughed? should they have snowploughed?
V-ing perfect
should I have been snowploughing? should you have been snowploughing? should he have been snowploughing? should we have been snowploughing? should you have been snowploughing? should they have been snowploughing?
Interro-negative form
Simple form
shouldn't I snowplough? shouldn't you snowplough? shouldn't he snowplough? shouldn't we snowplough? shouldn't you snowplough? shouldn't they snowplough?
V-ing form
shouldn't I be snowploughing? shouldn't you be snowploughing? shouldn't he be snowploughing? shouldn't we be snowploughing? shouldn't you be snowploughing? shouldn't they be snowploughing?
Perfect
shouldn't I have snowploughed? shouldn't you have snowploughed? shouldn't he have snowploughed? shouldn't we have snowploughed? shouldn't you have snowploughed? shouldn't they have snowploughed?
V-ing perfect
shouldn't I have been snowploughing? shouldn't you have been snowploughing? shouldn't he have been snowploughing? shouldn't we have been snowploughing? shouldn't you have been snowploughing? shouldn't they have been snowploughing?