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