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