could burden
Verbo regular: burden - burdened- burdened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could burden
you could burden
he could burden
we could burden
you could burden
they could burden 	I could be burdening
you could be burdening
he could be burdening
we could be burdening
you could be burdening
they could be burdening	I could have burdened
you could have burdened
he could have burdened
we could have burdened
you could have burdened
they could have burdened	I could have been burdening
you could have been burdening
he could have been burdening
we could have been burdening
you could have been burdening
they could have been burdening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not burden
you could not burden
he could not burden
we could not burden
you could not burden
they could not burden 	I could not be burdening
you could not be burdening
he could not be burdening
we could not be burdening
you could not be burdening
they could not be burdening	I could not have burdened
you could not have burdened
he could not have burdened
we could not have burdened
you could not have burdened
they could not have burdened	I could not have been burdening
you could not have been burdening
he could not have been burdening
we could not have been burdening
you could not have been burdening
they could not have been burdening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I burden?
could you burden?
could he burden?
could we burden?
could you burden?
could they burden? 	could I be burdening?
could you be burdening?
could he be burdening?
could we be burdening?
could you be burdening?
could they be burdening? 	could I have burdened?
could you have burdened?
could he have burdened?
could we have burdened?
could you have burdened?
could they have burdened? 	could I have been burdening?
could you have been burdening?
could he have been burdening?
could we have been burdening?
could you have been burdening?
could they have been burdening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not burden?
could you not burden?
could he not burden?
could we not burden?
could you not burden?
could they not burden? 	could I not be burdening?
could you not be burdening?
could he not be burdening?
could we not be burdening?
could you not be burdening?
could they not be burdening? 	could I not have burdened?
could you not have burdened?
could he not have burdened?
could we not have burdened?
could you not have burdened?
could they not have burdened? 	could I not have been burdening?
could you not have been burdening?
could he not have been burdening?
could we not have been burdening?
could you not have been burdening?
could they not have been burdening?