I could echo you could echo she could echo we could echo you could echo they could echo
Forma com V-ing
I could be echoing you could be echoing she could be echoing we could be echoing you could be echoing they could be echoing
Perfeito
I could have echoed you could have echoed she could have echoed we could have echoed you could have echoed they could have echoed
Perfeito com V-ing
I could have been echoing you could have been echoing she could have been echoing we could have been echoing you could have been echoing they could have been echoing
Negação
Forma simple
I couldn't echo you couldn't echo she couldn't echo we couldn't echo you couldn't echo they couldn't echo
Forma com V-ing
I couldn't be echoing you couldn't be echoing she couldn't be echoing we couldn't be echoing you couldn't be echoing they couldn't be echoing
Perfeito
I couldn't have echoed you couldn't have echoed she couldn't have echoed we couldn't have echoed you couldn't have echoed they couldn't have echoed
Perfeito com V-ing
I couldn't have been echoing you couldn't have been echoing she couldn't have been echoing we couldn't have been echoing you couldn't have been echoing they couldn't have been echoing
Forma interrogativa
Forma simple
could I echo? could you echo? could she echo? could we echo? could you echo? could they echo?
Forma com V-ing
could I be echoing? could you be echoing? could she be echoing? could we be echoing? could you be echoing? could they be echoing?
Perfeito
could I have echoed? could you have echoed? could she have echoed? could we have echoed? could you have echoed? could they have echoed?
Perfeito com V-ing
could I have been echoing? could you have been echoing? could she have been echoing? could we have been echoing? could you have been echoing? could they have been echoing?
Forma interro-Negação
Forma simple
couldn't I echo? couldn't you echo? couldn't she echo? couldn't we echo? couldn't you echo? couldn't they echo?
Forma com V-ing
couldn't I be echoing? couldn't you be echoing? couldn't she be echoing? couldn't we be echoing? couldn't you be echoing? couldn't they be echoing?
Perfeito
couldn't I have echoed? couldn't you have echoed? couldn't she have echoed? couldn't we have echoed? couldn't you have echoed? couldn't they have echoed?
Perfeito com V-ing
couldn't I have been echoing? couldn't you have been echoing? couldn't she have been echoing? couldn't we have been echoing? couldn't you have been echoing? couldn't they have been echoing?