I could reply you could reply he could reply we could reply you could reply they could reply
Forma con V-ing
I could be replying you could be replying he could be replying we could be replying you could be replying they could be replying
Perfecto
I could have replied you could have replied he could have replied we could have replied you could have replied they could have replied
Perfecto con V-ing
I could have been replying you could have been replying he could have been replying we could have been replying you could have been replying they could have been replying
Negación
Forma simple
I couldn't reply you couldn't reply he couldn't reply we couldn't reply you couldn't reply they couldn't reply
Forma con V-ing
I couldn't be replying you couldn't be replying he couldn't be replying we couldn't be replying you couldn't be replying they couldn't be replying
Perfecto
I couldn't have replied you couldn't have replied he couldn't have replied we couldn't have replied you couldn't have replied they couldn't have replied
Perfecto con V-ing
I couldn't have been replying you couldn't have been replying he couldn't have been replying we couldn't have been replying you couldn't have been replying they couldn't have been replying
Forma interrogativa
Forma simple
could I reply? could you reply? could he reply? could we reply? could you reply? could they reply?
Forma con V-ing
could I be replying? could you be replying? could he be replying? could we be replying? could you be replying? could they be replying?
Perfecto
could I have replied? could you have replied? could he have replied? could we have replied? could you have replied? could they have replied?
Perfecto con V-ing
could I have been replying? could you have been replying? could he have been replying? could we have been replying? could you have been replying? could they have been replying?
Forma interro-negativa
Forma simple
couldn't I reply? couldn't you reply? couldn't he reply? couldn't we reply? couldn't you reply? couldn't they reply?
Forma con V-ing
couldn't I be replying? couldn't you be replying? couldn't he be replying? couldn't we be replying? couldn't you be replying? couldn't they be replying?
Perfecto
couldn't I have replied? couldn't you have replied? couldn't he have replied? couldn't we have replied? couldn't you have replied? couldn't they have replied?
Perfecto con V-ing
couldn't I have been replying? couldn't you have been replying? couldn't he have been replying? couldn't we have been replying? couldn't you have been replying? couldn't they have been replying?