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