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