can sharpen
Verbo regular: sharpen - sharpened- sharpened

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

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

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

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