I could achieve you could achieve she could achieve we could achieve you could achieve they could achieve
Forma con V-ing
I could be achieving you could be achieving she could be achieving we could be achieving you could be achieving they could be achieving
Perfecto
I could have achieved you could have achieved she could have achieved we could have achieved you could have achieved they could have achieved
Perfecto con V-ing
I could have been achieving you could have been achieving she could have been achieving we could have been achieving you could have been achieving they could have been achieving
Negación
Forma simple
I could not achieve you could not achieve she could not achieve we could not achieve you could not achieve they could not achieve
Forma con V-ing
I could not be achieving you could not be achieving she could not be achieving we could not be achieving you could not be achieving they could not be achieving
Perfecto
I could not have achieved you could not have achieved she could not have achieved we could not have achieved you could not have achieved they could not have achieved
Perfecto con V-ing
I could not have been achieving you could not have been achieving she 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 she achieve? could we achieve? could you achieve? could they achieve?
Forma con V-ing
could I be achieving? could you be achieving? could she be achieving? could we be achieving? could you be achieving? could they be achieving?
Perfecto
could I have achieved? could you have achieved? could she have achieved? could we have achieved? could you have achieved? could they have achieved?
Perfecto con V-ing
could I have been achieving? could you have been achieving? could she have been achieving? could we have been achieving? could you have been achieving? could they have been achieving?
Forma interro-negativa
Forma simple
could I not achieve? could you not achieve? could she not achieve? could we not achieve? could you not achieve? could they not achieve?
Forma con V-ing
could I not be achieving? could you not be achieving? could she not be achieving? could we not be achieving? could you not be achieving? could they not be achieving?
Perfecto
could I not have achieved? could you not have achieved? could she not have achieved? could we not have achieved? could you not have achieved? could they not have achieved?
Perfecto con V-ing
could I not have been achieving? could you not have been achieving? could she not have been achieving? could we not have been achieving? could you not have been achieving? could they not have been achieving?