could plough
Regular verb: plough - ploughed- ploughed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could plough
you could plough
he could plough
we could plough
you could plough
they could plough 	I could be ploughing
you could be ploughing
he could be ploughing
we could be ploughing
you could be ploughing
they could be ploughing	I could have ploughed
you could have ploughed
he 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
he 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 couldn't plough
you couldn't plough
he couldn't plough
we couldn't plough
you couldn't plough
they couldn't plough 	I couldn't be ploughing
you couldn't be ploughing
he couldn't be ploughing
we couldn't be ploughing
you couldn't be ploughing
they couldn't be ploughing	I couldn't have ploughed
you couldn't have ploughed
he couldn't have ploughed
we couldn't have ploughed
you couldn't have ploughed
they couldn't have ploughed	I couldn't have been ploughing
you couldn't have been ploughing
he couldn't have been ploughing
we couldn't have been ploughing
you couldn't have been ploughing
they couldn't have been ploughing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I plough?
could you plough?
could he plough?
could we plough?
could you plough?
could they plough? 	could I be ploughing?
could you be ploughing?
could he be ploughing?
could we be ploughing?
could you be ploughing?
could they be ploughing? 	could I have ploughed?
could you have ploughed?
could he 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 he 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 	
couldn't I plough?
couldn't you plough?
couldn't he plough?
couldn't we plough?
couldn't you plough?
couldn't they plough? 	couldn't I be ploughing?
couldn't you be ploughing?
couldn't he be ploughing?
couldn't we be ploughing?
couldn't you be ploughing?
couldn't they be ploughing? 	couldn't I have ploughed?
couldn't you have ploughed?
couldn't he have ploughed?
couldn't we have ploughed?
couldn't you have ploughed?
couldn't they have ploughed? 	couldn't I have been ploughing?
couldn't you have been ploughing?
couldn't he have been ploughing?
couldn't we have been ploughing?
couldn't you have been ploughing?
couldn't they have been ploughing?