I could achieve you could achieve he could achieve we could achieve you could achieve they could achieve
Forma com V-ing
I could be achieving you could be achieving he could be achieving we could be achieving you could be achieving they could be achieving
Perfeito
I could have achieved you could have achieved he could have achieved we could have achieved you could have achieved they could have achieved
Perfeito com V-ing
I could have been achieving you could have been achieving he could have been achieving we could have been achieving you could have been achieving they could have been achieving
Negação
Forma simple
I could not achieve you could not achieve he could not achieve we could not achieve you could not achieve they could not achieve
Forma com V-ing
I could not be achieving you could not be achieving he could not be achieving we could not be achieving you could not be achieving they could not be achieving
Perfeito
I could not have achieved you could not have achieved he could not have achieved we could not have achieved you could not have achieved they could not have achieved
Perfeito com V-ing
I could not have been achieving you could not have been achieving he could not have been achieving we could not have been achieving you could not have been achieving they could not have been achieving
Forma interrogativa
Forma simple
could I achieve? could you achieve? could he achieve? could we achieve? could you achieve? could they achieve?
Forma com V-ing
could I be achieving? could you be achieving? could he be achieving? could we be achieving? could you be achieving? could they be achieving?
Perfeito
could I have achieved? could you have achieved? could he have achieved? could we have achieved? could you have achieved? could they have achieved?
Perfeito com V-ing
could I have been achieving? could you have been achieving? could he have been achieving? could we have been achieving? could you have been achieving? could they have been achieving?
Forma interro-Negação
Forma simple
could I not achieve? could you not achieve? could he not achieve? could we not achieve? could you not achieve? could they not achieve?
Forma com V-ing
could I not be achieving? could you not be achieving? could he not be achieving? could we not be achieving? could you not be achieving? could they not be achieving?
Perfeito
could I not have achieved? could you not have achieved? could he not have achieved? could we not have achieved? could you not have achieved? could they not have achieved?
Perfeito com V-ing
could I not have been achieving? could you not have been achieving? could he not have been achieving? could we not have been achieving? could you not have been achieving? could they not have been achieving?