English verb conjugation
COULD PLOUGH

Regular verb: plough - ploughed - ploughed

Affirmation

Simple form	V-ing form
I could plough you could plough she could plough we could plough you could plough they could plough	I could be ploughing you could be ploughing she could be ploughing we could be ploughing you could be ploughing they could be ploughing
Perfect	V-ing perfect
I could have ploughed you could have ploughed she could have ploughed we could have ploughed you could have ploughed they could have ploughed	I could have been ploughing you could have been ploughing she could have been ploughing we could have been ploughing you could have been ploughing they could have been ploughing

Negation

Simple form	V-ing form
I could not plough you could not plough she could not plough we could not plough you could not plough they could not plough	I could not be ploughing you could not be ploughing she could not be ploughing we could not be ploughing you could not be ploughing they could not be ploughing
Perfect	V-ing perfect
I could not have ploughed you could not have ploughed she could not have ploughed we could not have ploughed you could not have ploughed they could not have ploughed	I could not have been ploughing you could not have been ploughing she could not have been ploughing we could not have been ploughing you could not have been ploughing they could not have been ploughing

Interrogative form

Simple form	V-ing form
could I plough? could you plough? could she plough? could we plough? could you plough? could they plough?	could I be ploughing? could you be ploughing? could she be ploughing? could we be ploughing? could you be ploughing? could they be ploughing?
Perfect	V-ing perfect
could I have ploughed? could you have ploughed? could she have ploughed? could we have ploughed? could you have ploughed? could they have ploughed?	could I have been ploughing? could you have been ploughing? could she have been ploughing? could we have been ploughing? could you have been ploughing? could they have been ploughing?

Interro-negative form

Simple form	V-ing form
could I not plough? could you not plough? could she not plough? could we not plough? could you not plough? could they not plough?	could I not be ploughing? could you not be ploughing? could she not be ploughing? could we not be ploughing? could you not be ploughing? could they not be ploughing?
Perfect	V-ing perfect
could I not have ploughed? could you not have ploughed? could she not have ploughed? could we not have ploughed? could you not have ploughed? could they not have ploughed?	could I not have been ploughing? could you not have been ploughing? could she not have been ploughing? could we not have been ploughing? could you not have been ploughing? could they not have been ploughing?