could joint
Verbo regular: joint - jointed- jointed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could joint
you could joint
he could joint
we could joint
you could joint
they could joint 	I could be jointing
you could be jointing
he could be jointing
we could be jointing
you could be jointing
they could be jointing	I could have jointed
you could have jointed
he could have jointed
we could have jointed
you could have jointed
they could have jointed	I could have been jointing
you could have been jointing
he could have been jointing
we could have been jointing
you could have been jointing
they could have been jointing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't joint
you couldn't joint
he couldn't joint
we couldn't joint
you couldn't joint
they couldn't joint 	I couldn't be jointing
you couldn't be jointing
he couldn't be jointing
we couldn't be jointing
you couldn't be jointing
they couldn't be jointing	I couldn't have jointed
you couldn't have jointed
he couldn't have jointed
we couldn't have jointed
you couldn't have jointed
they couldn't have jointed	I couldn't have been jointing
you couldn't have been jointing
he couldn't have been jointing
we couldn't have been jointing
you couldn't have been jointing
they couldn't have been jointing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I joint?
could you joint?
could he joint?
could we joint?
could you joint?
could they joint? 	could I be jointing?
could you be jointing?
could he be jointing?
could we be jointing?
could you be jointing?
could they be jointing? 	could I have jointed?
could you have jointed?
could he have jointed?
could we have jointed?
could you have jointed?
could they have jointed? 	could I have been jointing?
could you have been jointing?
could he have been jointing?
could we have been jointing?
could you have been jointing?
could they have been jointing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I joint?
couldn't you joint?
couldn't he joint?
couldn't we joint?
couldn't you joint?
couldn't they joint? 	couldn't I be jointing?
couldn't you be jointing?
couldn't he be jointing?
couldn't we be jointing?
couldn't you be jointing?
couldn't they be jointing? 	couldn't I have jointed?
couldn't you have jointed?
couldn't he have jointed?
couldn't we have jointed?
couldn't you have jointed?
couldn't they have jointed? 	couldn't I have been jointing?
couldn't you have been jointing?
couldn't he have been jointing?
couldn't we have been jointing?
couldn't you have been jointing?
couldn't they have been jointing?