could snowplough
Regular verb: snowplough - snowploughed- snowploughed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could snowplough
you could snowplough
he could snowplough
we could snowplough
you could snowplough
they could snowplough 	I could be snowploughing
you could be snowploughing
he could be snowploughing
we could be snowploughing
you could be snowploughing
they could be snowploughing	I could have snowploughed
you could have snowploughed
he could have snowploughed
we could have snowploughed
you could have snowploughed
they could have snowploughed	I could have been snowploughing
you could have been snowploughing
he could have been snowploughing
we could have been snowploughing
you could have been snowploughing
they could have been snowploughing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't snowplough
you couldn't snowplough
he couldn't snowplough
we couldn't snowplough
you couldn't snowplough
they couldn't snowplough 	I couldn't be snowploughing
you couldn't be snowploughing
he couldn't be snowploughing
we couldn't be snowploughing
you couldn't be snowploughing
they couldn't be snowploughing	I couldn't have snowploughed
you couldn't have snowploughed
he couldn't have snowploughed
we couldn't have snowploughed
you couldn't have snowploughed
they couldn't have snowploughed	I couldn't have been snowploughing
you couldn't have been snowploughing
he couldn't have been snowploughing
we couldn't have been snowploughing
you couldn't have been snowploughing
they couldn't have been snowploughing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I snowplough?
could you snowplough?
could he snowplough?
could we snowplough?
could you snowplough?
could they snowplough? 	could I be snowploughing?
could you be snowploughing?
could he be snowploughing?
could we be snowploughing?
could you be snowploughing?
could they be snowploughing? 	could I have snowploughed?
could you have snowploughed?
could he have snowploughed?
could we have snowploughed?
could you have snowploughed?
could they have snowploughed? 	could I have been snowploughing?
could you have been snowploughing?
could he have been snowploughing?
could we have been snowploughing?
could you have been snowploughing?
could they have been snowploughing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I snowplough?
couldn't you snowplough?
couldn't he snowplough?
couldn't we snowplough?
couldn't you snowplough?
couldn't they snowplough? 	couldn't I be snowploughing?
couldn't you be snowploughing?
couldn't he be snowploughing?
couldn't we be snowploughing?
couldn't you be snowploughing?
couldn't they be snowploughing? 	couldn't I have snowploughed?
couldn't you have snowploughed?
couldn't he have snowploughed?
couldn't we have snowploughed?
couldn't you have snowploughed?
couldn't they have snowploughed? 	couldn't I have been snowploughing?
couldn't you have been snowploughing?
couldn't he have been snowploughing?
couldn't we have been snowploughing?
couldn't you have been snowploughing?
couldn't they have been snowploughing?