could fence
Verbo regular: fence - fenced- fenced

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could fence
you could fence
he could fence
we could fence
you could fence
they could fence 	I could be fencing
you could be fencing
he could be fencing
we could be fencing
you could be fencing
they could be fencing	I could have fenced
you could have fenced
he could have fenced
we could have fenced
you could have fenced
they could have fenced	I could have been fencing
you could have been fencing
he could have been fencing
we could have been fencing
you could have been fencing
they could have been fencing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't fence
you couldn't fence
he couldn't fence
we couldn't fence
you couldn't fence
they couldn't fence 	I couldn't be fencing
you couldn't be fencing
he couldn't be fencing
we couldn't be fencing
you couldn't be fencing
they couldn't be fencing	I couldn't have fenced
you couldn't have fenced
he couldn't have fenced
we couldn't have fenced
you couldn't have fenced
they couldn't have fenced	I couldn't have been fencing
you couldn't have been fencing
he couldn't have been fencing
we couldn't have been fencing
you couldn't have been fencing
they couldn't have been fencing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I fence?
could you fence?
could he fence?
could we fence?
could you fence?
could they fence? 	could I be fencing?
could you be fencing?
could he be fencing?
could we be fencing?
could you be fencing?
could they be fencing? 	could I have fenced?
could you have fenced?
could he have fenced?
could we have fenced?
could you have fenced?
could they have fenced? 	could I have been fencing?
could you have been fencing?
could he have been fencing?
could we have been fencing?
could you have been fencing?
could they have been fencing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I fence?
couldn't you fence?
couldn't he fence?
couldn't we fence?
couldn't you fence?
couldn't they fence? 	couldn't I be fencing?
couldn't you be fencing?
couldn't he be fencing?
couldn't we be fencing?
couldn't you be fencing?
couldn't they be fencing? 	couldn't I have fenced?
couldn't you have fenced?
couldn't he have fenced?
couldn't we have fenced?
couldn't you have fenced?
couldn't they have fenced? 	couldn't I have been fencing?
couldn't you have been fencing?
couldn't he have been fencing?
couldn't we have been fencing?
couldn't you have been fencing?
couldn't they have been fencing?