could snowplough
Regular verb: snowplough - snowploughed- snowploughed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could snowplough
you could snowplough
she could snowplough
we could snowplough
you could snowplough
they could snowplough 	I could be snowploughing
you could be snowploughing
she could be snowploughing
we could be snowploughing
you could be snowploughing
they could be snowploughing	I could have snowploughed
you could have snowploughed
she 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
she 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 could not snowplough
you could not snowplough
she could not snowplough
we could not snowplough
you could not snowplough
they could not snowplough 	I could not be snowploughing
you could not be snowploughing
she could not be snowploughing
we could not be snowploughing
you could not be snowploughing
they could not be snowploughing	I could not have snowploughed
you could not have snowploughed
she could not have snowploughed
we could not have snowploughed
you could not have snowploughed
they could not have snowploughed	I could not have been snowploughing
you could not have been snowploughing
she could not have been snowploughing
we could not have been snowploughing
you could not have been snowploughing
they could not have been snowploughing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I snowplough?
could you snowplough?
could she snowplough?
could we snowplough?
could you snowplough?
could they snowplough? 	could I be snowploughing?
could you be snowploughing?
could she be snowploughing?
could we be snowploughing?
could you be snowploughing?
could they be snowploughing? 	could I have snowploughed?
could you have snowploughed?
could she 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 she 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 	
could I not snowplough?
could you not snowplough?
could she not snowplough?
could we not snowplough?
could you not snowplough?
could they not snowplough? 	could I not be snowploughing?
could you not be snowploughing?
could she not be snowploughing?
could we not be snowploughing?
could you not be snowploughing?
could they not be snowploughing? 	could I not have snowploughed?
could you not have snowploughed?
could she not have snowploughed?
could we not have snowploughed?
could you not have snowploughed?
could they not have snowploughed? 	could I not have been snowploughing?
could you not have been snowploughing?
could she not have been snowploughing?
could we not have been snowploughing?
could you not have been snowploughing?
could they not have been snowploughing?