could stress
Verbo regular: stress - stressed- stressed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could stress
you could stress
he could stress
we could stress
you could stress
they could stress 	I could be stressing
you could be stressing
he could be stressing
we could be stressing
you could be stressing
they could be stressing	I could have stressed
you could have stressed
he could have stressed
we could have stressed
you could have stressed
they could have stressed	I could have been stressing
you could have been stressing
he could have been stressing
we could have been stressing
you could have been stressing
they could have been stressing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't stress
you couldn't stress
he couldn't stress
we couldn't stress
you couldn't stress
they couldn't stress 	I couldn't be stressing
you couldn't be stressing
he couldn't be stressing
we couldn't be stressing
you couldn't be stressing
they couldn't be stressing	I couldn't have stressed
you couldn't have stressed
he couldn't have stressed
we couldn't have stressed
you couldn't have stressed
they couldn't have stressed	I couldn't have been stressing
you couldn't have been stressing
he couldn't have been stressing
we couldn't have been stressing
you couldn't have been stressing
they couldn't have been stressing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I stress?
could you stress?
could he stress?
could we stress?
could you stress?
could they stress? 	could I be stressing?
could you be stressing?
could he be stressing?
could we be stressing?
could you be stressing?
could they be stressing? 	could I have stressed?
could you have stressed?
could he have stressed?
could we have stressed?
could you have stressed?
could they have stressed? 	could I have been stressing?
could you have been stressing?
could he have been stressing?
could we have been stressing?
could you have been stressing?
could they have been stressing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I stress?
couldn't you stress?
couldn't he stress?
couldn't we stress?
couldn't you stress?
couldn't they stress? 	couldn't I be stressing?
couldn't you be stressing?
couldn't he be stressing?
couldn't we be stressing?
couldn't you be stressing?
couldn't they be stressing? 	couldn't I have stressed?
couldn't you have stressed?
couldn't he have stressed?
couldn't we have stressed?
couldn't you have stressed?
couldn't they have stressed? 	couldn't I have been stressing?
couldn't you have been stressing?
couldn't he have been stressing?
couldn't we have been stressing?
couldn't you have been stressing?
couldn't they have been stressing?