I could browse you could browse she could browse we could browse you could browse they could browse
Forma com V-ing
I could be browsing you could be browsing she could be browsing we could be browsing you could be browsing they could be browsing
Perfeito
I could have browsed you could have browsed she could have browsed we could have browsed you could have browsed they could have browsed
Perfeito com V-ing
I could have been browsing you could have been browsing she could have been browsing we could have been browsing you could have been browsing they could have been browsing
Negação
Forma simple
I could not browse you could not browse she could not browse we could not browse you could not browse they could not browse
Forma com V-ing
I could not be browsing you could not be browsing she could not be browsing we could not be browsing you could not be browsing they could not be browsing
Perfeito
I could not have browsed you could not have browsed she could not have browsed we could not have browsed you could not have browsed they could not have browsed
Perfeito com V-ing
I could not have been browsing you could not have been browsing she could not have been browsing we could not have been browsing you could not have been browsing they could not have been browsing
Forma interrogativa
Forma simple
could I browse? could you browse? could she browse? could we browse? could you browse? could they browse?
Forma com V-ing
could I be browsing? could you be browsing? could she be browsing? could we be browsing? could you be browsing? could they be browsing?
Perfeito
could I have browsed? could you have browsed? could she have browsed? could we have browsed? could you have browsed? could they have browsed?
Perfeito com V-ing
could I have been browsing? could you have been browsing? could she have been browsing? could we have been browsing? could you have been browsing? could they have been browsing?
Forma interro-Negação
Forma simple
could I not browse? could you not browse? could she not browse? could we not browse? could you not browse? could they not browse?
Forma com V-ing
could I not be browsing? could you not be browsing? could she not be browsing? could we not be browsing? could you not be browsing? could they not be browsing?
Perfeito
could I not have browsed? could you not have browsed? could she not have browsed? could we not have browsed? could you not have browsed? could they not have browsed?
Perfeito com V-ing
could I not have been browsing? could you not have been browsing? could she not have been browsing? could we not have been browsing? could you not have been browsing? could they not have been browsing?