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