could plough
Regular verb: plough - ploughed- ploughed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?