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