I could detect you could detect he could detect we could detect you could detect they could detect
Forma con V-ing
I could be detecting you could be detecting he could be detecting we could be detecting you could be detecting they could be detecting
Perfecto
I could have detected you could have detected he could have detected we could have detected you could have detected they could have detected
Perfecto con V-ing
I could have been detecting you could have been detecting he could have been detecting we could have been detecting you could have been detecting they could have been detecting
Negación
Forma simple
I couldn't detect you couldn't detect he couldn't detect we couldn't detect you couldn't detect they couldn't detect
Forma con V-ing
I couldn't be detecting you couldn't be detecting he couldn't be detecting we couldn't be detecting you couldn't be detecting they couldn't be detecting
Perfecto
I couldn't have detected you couldn't have detected he couldn't have detected we couldn't have detected you couldn't have detected they couldn't have detected
Perfecto con V-ing
I couldn't have been detecting you couldn't have been detecting he couldn't have been detecting we couldn't have been detecting you couldn't have been detecting they couldn't have been detecting
Forma interrogativa
Forma simple
could I detect? could you detect? could he detect? could we detect? could you detect? could they detect?
Forma con V-ing
could I be detecting? could you be detecting? could he be detecting? could we be detecting? could you be detecting? could they be detecting?
Perfecto
could I have detected? could you have detected? could he have detected? could we have detected? could you have detected? could they have detected?
Perfecto con V-ing
could I have been detecting? could you have been detecting? could he have been detecting? could we have been detecting? could you have been detecting? could they have been detecting?
Forma interro-negativa
Forma simple
couldn't I detect? couldn't you detect? couldn't he detect? couldn't we detect? couldn't you detect? couldn't they detect?
Forma con V-ing
couldn't I be detecting? couldn't you be detecting? couldn't he be detecting? couldn't we be detecting? couldn't you be detecting? couldn't they be detecting?
Perfecto
couldn't I have detected? couldn't you have detected? couldn't he have detected? couldn't we have detected? couldn't you have detected? couldn't they have detected?
Perfecto con V-ing
couldn't I have been detecting? couldn't you have been detecting? couldn't he have been detecting? couldn't we have been detecting? couldn't you have been detecting? couldn't they have been detecting?