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