I could combine you could combine he could combine we could combine you could combine they could combine
Forma com V-ing
I could be combining you could be combining he could be combining we could be combining you could be combining they could be combining
Perfeito
I could have combined you could have combined he could have combined we could have combined you could have combined they could have combined
Perfeito com V-ing
I could have been combining you could have been combining he could have been combining we could have been combining you could have been combining they could have been combining
Negação
Forma simple
I couldn't combine you couldn't combine he couldn't combine we couldn't combine you couldn't combine they couldn't combine
Forma com V-ing
I couldn't be combining you couldn't be combining he couldn't be combining we couldn't be combining you couldn't be combining they couldn't be combining
Perfeito
I couldn't have combined you couldn't have combined he couldn't have combined we couldn't have combined you couldn't have combined they couldn't have combined
Perfeito com V-ing
I couldn't have been combining you couldn't have been combining he couldn't have been combining we couldn't have been combining you couldn't have been combining they couldn't have been combining
Forma interrogativa
Forma simple
could I combine? could you combine? could he combine? could we combine? could you combine? could they combine?
Forma com V-ing
could I be combining? could you be combining? could he be combining? could we be combining? could you be combining? could they be combining?
Perfeito
could I have combined? could you have combined? could he have combined? could we have combined? could you have combined? could they have combined?
Perfeito com V-ing
could I have been combining? could you have been combining? could he have been combining? could we have been combining? could you have been combining? could they have been combining?
Forma interro-Negação
Forma simple
couldn't I combine? couldn't you combine? couldn't he combine? couldn't we combine? couldn't you combine? couldn't they combine?
Forma com V-ing
couldn't I be combining? couldn't you be combining? couldn't he be combining? couldn't we be combining? couldn't you be combining? couldn't they be combining?
Perfeito
couldn't I have combined? couldn't you have combined? couldn't he have combined? couldn't we have combined? couldn't you have combined? couldn't they have combined?
Perfeito com V-ing
couldn't I have been combining? couldn't you have been combining? couldn't he have been combining? couldn't we have been combining? couldn't you have been combining? couldn't they have been combining?