Conjugación del verbo inglés
COULD SHARPEN

Verbo regular: sharpen - sharpened - sharpened

Afirmación

Forma simple	Forma con V-ing
I could sharpen you could sharpen he could sharpen we could sharpen you could sharpen they could sharpen	I could be sharpening you could be sharpening he could be sharpening we could be sharpening you could be sharpening they could be sharpening
Perfecto	Perfecto con V-ing
I could have sharpened you could have sharpened he could have sharpened we could have sharpened you could have sharpened they could have sharpened	I could have been sharpening you could have been sharpening he could have been sharpening we could have been sharpening you could have been sharpening they could have been sharpening

Negación

Forma simple	Forma con V-ing
I could not sharpen you could not sharpen he could not sharpen we could not sharpen you could not sharpen they could not sharpen	I could not be sharpening you could not be sharpening he could not be sharpening we could not be sharpening you could not be sharpening they could not be sharpening
Perfecto	Perfecto con V-ing
I could not have sharpened you could not have sharpened he could not have sharpened we could not have sharpened you could not have sharpened they could not have sharpened	I could not have been sharpening you could not have been sharpening he could not have been sharpening we could not have been sharpening you could not have been sharpening they could not have been sharpening

Forma interrogativa

Forma simple	Forma con V-ing
could I sharpen? could you sharpen? could he sharpen? could we sharpen? could you sharpen? could they sharpen?	could I be sharpening? could you be sharpening? could he be sharpening? could we be sharpening? could you be sharpening? could they be sharpening?
Perfecto	Perfecto con V-ing
could I have sharpened? could you have sharpened? could he have sharpened? could we have sharpened? could you have sharpened? could they have sharpened?	could I have been sharpening? could you have been sharpening? could he have been sharpening? could we have been sharpening? could you have been sharpening? could they have been sharpening?

Forma interro-negativa

Forma simple	Forma con V-ing
could I not sharpen? could you not sharpen? could he not sharpen? could we not sharpen? could you not sharpen? could they not sharpen?	could I not be sharpening? could you not be sharpening? could he not be sharpening? could we not be sharpening? could you not be sharpening? could they not be sharpening?
Perfecto	Perfecto con V-ing
could I not have sharpened? could you not have sharpened? could he not have sharpened? could we not have sharpened? could you not have sharpened? could they not have sharpened?	could I not have been sharpening? could you not have been sharpening? could he not have been sharpening? could we not have been sharpening? could you not have been sharpening? could they not have been sharpening?