Conjugación del verbo inglés
COULD SKETCH

Verbo regular: sketch - sketched - sketched

Afirmación

Forma simple	Forma con V-ing
I could sketch you could sketch he could sketch we could sketch you could sketch they could sketch	I could be sketching you could be sketching he could be sketching we could be sketching you could be sketching they could be sketching
Perfecto	Perfecto con V-ing
I could have sketched you could have sketched he could have sketched we could have sketched you could have sketched they could have sketched	I could have been sketching you could have been sketching he could have been sketching we could have been sketching you could have been sketching they could have been sketching

Negación

Forma simple	Forma con V-ing
I could not sketch you could not sketch he could not sketch we could not sketch you could not sketch they could not sketch	I could not be sketching you could not be sketching he could not be sketching we could not be sketching you could not be sketching they could not be sketching
Perfecto	Perfecto con V-ing
I could not have sketched you could not have sketched he could not have sketched we could not have sketched you could not have sketched they could not have sketched	I could not have been sketching you could not have been sketching he could not have been sketching we could not have been sketching you could not have been sketching they could not have been sketching

Forma interrogativa

Forma simple	Forma con V-ing
could I sketch? could you sketch? could he sketch? could we sketch? could you sketch? could they sketch?	could I be sketching? could you be sketching? could he be sketching? could we be sketching? could you be sketching? could they be sketching?
Perfecto	Perfecto con V-ing
could I have sketched? could you have sketched? could he have sketched? could we have sketched? could you have sketched? could they have sketched?	could I have been sketching? could you have been sketching? could he have been sketching? could we have been sketching? could you have been sketching? could they have been sketching?

Forma interro-negativa

Forma simple	Forma con V-ing
could I not sketch? could you not sketch? could he not sketch? could we not sketch? could you not sketch? could they not sketch?	could I not be sketching? could you not be sketching? could he not be sketching? could we not be sketching? could you not be sketching? could they not be sketching?
Perfecto	Perfecto con V-ing
could I not have sketched? could you not have sketched? could he not have sketched? could we not have sketched? could you not have sketched? could they not have sketched?	could I not have been sketching? could you not have been sketching? could he not have been sketching? could we not have been sketching? could you not have been sketching? could they not have been sketching?