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