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