could descend
Verbo regular: descend - descended- descended

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could descend
you could descend
she could descend
we could descend
you could descend
they could descend 	I could be descending
you could be descending
she could be descending
we could be descending
you could be descending
they could be descending	I could have descended
you could have descended
she could have descended
we could have descended
you could have descended
they could have descended	I could have been descending
you could have been descending
she could have been descending
we could have been descending
you could have been descending
they could have been descending	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't descend
you couldn't descend
she couldn't descend
we couldn't descend
you couldn't descend
they couldn't descend 	I couldn't be descending
you couldn't be descending
she couldn't be descending
we couldn't be descending
you couldn't be descending
they couldn't be descending	I couldn't have descended
you couldn't have descended
she couldn't have descended
we couldn't have descended
you couldn't have descended
they couldn't have descended	I couldn't have been descending
you couldn't have been descending
she couldn't have been descending
we couldn't have been descending
you couldn't have been descending
they couldn't have been descending	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I descend?
could you descend?
could she descend?
could we descend?
could you descend?
could they descend? 	could I be descending?
could you be descending?
could she be descending?
could we be descending?
could you be descending?
could they be descending? 	could I have descended?
could you have descended?
could she have descended?
could we have descended?
could you have descended?
could they have descended? 	could I have been descending?
could you have been descending?
could she have been descending?
could we have been descending?
could you have been descending?
could they have been descending? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I descend?
couldn't you descend?
couldn't she descend?
couldn't we descend?
couldn't you descend?
couldn't they descend? 	couldn't I be descending?
couldn't you be descending?
couldn't she be descending?
couldn't we be descending?
couldn't you be descending?
couldn't they be descending? 	couldn't I have descended?
couldn't you have descended?
couldn't she have descended?
couldn't we have descended?
couldn't you have descended?
couldn't they have descended? 	couldn't I have been descending?
couldn't you have been descending?
couldn't she have been descending?
couldn't we have been descending?
couldn't you have been descending?
couldn't they have been descending?