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