I could assist you could assist he could assist we could assist you could assist they could assist
Forma com V-ing
I could be assisting you could be assisting he could be assisting we could be assisting you could be assisting they could be assisting
Perfeito
I could have assisted you could have assisted he could have assisted we could have assisted you could have assisted they could have assisted
Perfeito com V-ing
I could have been assisting you could have been assisting he could have been assisting we could have been assisting you could have been assisting they could have been assisting
Negação
Forma simple
I couldn't assist you couldn't assist he couldn't assist we couldn't assist you couldn't assist they couldn't assist
Forma com V-ing
I couldn't be assisting you couldn't be assisting he couldn't be assisting we couldn't be assisting you couldn't be assisting they couldn't be assisting
Perfeito
I couldn't have assisted you couldn't have assisted he couldn't have assisted we couldn't have assisted you couldn't have assisted they couldn't have assisted
Perfeito com V-ing
I couldn't have been assisting you couldn't have been assisting he couldn't have been assisting we couldn't have been assisting you couldn't have been assisting they couldn't have been assisting
Forma interrogativa
Forma simple
could I assist? could you assist? could he assist? could we assist? could you assist? could they assist?
Forma com V-ing
could I be assisting? could you be assisting? could he be assisting? could we be assisting? could you be assisting? could they be assisting?
Perfeito
could I have assisted? could you have assisted? could he have assisted? could we have assisted? could you have assisted? could they have assisted?
Perfeito com V-ing
could I have been assisting? could you have been assisting? could he have been assisting? could we have been assisting? could you have been assisting? could they have been assisting?
Forma interro-Negação
Forma simple
couldn't I assist? couldn't you assist? couldn't he assist? couldn't we assist? couldn't you assist? couldn't they assist?
Forma com V-ing
couldn't I be assisting? couldn't you be assisting? couldn't he be assisting? couldn't we be assisting? couldn't you be assisting? couldn't they be assisting?
Perfeito
couldn't I have assisted? couldn't you have assisted? couldn't he have assisted? couldn't we have assisted? couldn't you have assisted? couldn't they have assisted?
Perfeito com V-ing
couldn't I have been assisting? couldn't you have been assisting? couldn't he have been assisting? couldn't we have been assisting? couldn't you have been assisting? couldn't they have been assisting?