English verb conjugation
COULD SNOWPLOUGH

Regular verb: snowplough - snowploughed - snowploughed

Affirmation

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