I could execute you could execute he could execute we could execute you could execute they could execute
Forma com V-ing
I could be executing you could be executing he could be executing we could be executing you could be executing they could be executing
Perfeito
I could have executed you could have executed he could have executed we could have executed you could have executed they could have executed
Perfeito com V-ing
I could have been executing you could have been executing he could have been executing we could have been executing you could have been executing they could have been executing
Negação
Forma simple
I couldn't execute you couldn't execute he couldn't execute we couldn't execute you couldn't execute they couldn't execute
Forma com V-ing
I couldn't be executing you couldn't be executing he couldn't be executing we couldn't be executing you couldn't be executing they couldn't be executing
Perfeito
I couldn't have executed you couldn't have executed he couldn't have executed we couldn't have executed you couldn't have executed they couldn't have executed
Perfeito com V-ing
I couldn't have been executing you couldn't have been executing he couldn't have been executing we couldn't have been executing you couldn't have been executing they couldn't have been executing
Forma interrogativa
Forma simple
could I execute? could you execute? could he execute? could we execute? could you execute? could they execute?
Forma com V-ing
could I be executing? could you be executing? could he be executing? could we be executing? could you be executing? could they be executing?
Perfeito
could I have executed? could you have executed? could he have executed? could we have executed? could you have executed? could they have executed?
Perfeito com V-ing
could I have been executing? could you have been executing? could he have been executing? could we have been executing? could you have been executing? could they have been executing?
Forma interro-Negação
Forma simple
couldn't I execute? couldn't you execute? couldn't he execute? couldn't we execute? couldn't you execute? couldn't they execute?
Forma com V-ing
couldn't I be executing? couldn't you be executing? couldn't he be executing? couldn't we be executing? couldn't you be executing? couldn't they be executing?
Perfeito
couldn't I have executed? couldn't you have executed? couldn't he have executed? couldn't we have executed? couldn't you have executed? couldn't they have executed?
Perfeito com V-ing
couldn't I have been executing? couldn't you have been executing? couldn't he have been executing? couldn't we have been executing? couldn't you have been executing? couldn't they have been executing?