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