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