must sharpen
Verbo regolare: sharpen - sharpened- sharpened

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must sharpen
you must sharpen
he must sharpen
we must sharpen
you must sharpen
they must sharpen 	I must be sharpening
you must be sharpening
he must be sharpening
we must be sharpening
you must be sharpening
they must be sharpening	I must have sharpened
you must have sharpened
he must have sharpened
we must have sharpened
you must have sharpened
they must have sharpened	I must have been sharpening
you must have been sharpening
he must have been sharpening
we must have been sharpening
you must have been sharpening
they must have been sharpening	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not sharpen
you must not sharpen
he must not sharpen
we must not sharpen
you must not sharpen
they must not sharpen 	I must not be sharpening
you must not be sharpening
he must not be sharpening
we must not be sharpening
you must not be sharpening
they must not be sharpening	I must not have sharpened
you must not have sharpened
he must not have sharpened
we must not have sharpened
you must not have sharpened
they must not have sharpened	I must not have been sharpening
you must not have been sharpening
he must not have been sharpening
we must not have been sharpening
you must not have been sharpening
they must not have been sharpening	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I sharpen?
must you sharpen?
must he sharpen?
must we sharpen?
must you sharpen?
must they sharpen? 	must I be sharpening?
must you be sharpening?
must he be sharpening?
must we be sharpening?
must you be sharpening?
must they be sharpening? 	must I have sharpened?
must you have sharpened?
must he have sharpened?
must we have sharpened?
must you have sharpened?
must they have sharpened? 	must I have been sharpening?
must you have been sharpening?
must he have been sharpening?
must we have been sharpening?
must you have been sharpening?
must they have been sharpening? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not sharpen?
must you not sharpen?
must he not sharpen?
must we not sharpen?
must you not sharpen?
must they not sharpen? 	must I not be sharpening?
must you not be sharpening?
must he not be sharpening?
must we not be sharpening?
must you not be sharpening?
must they not be sharpening? 	must I not have sharpened?
must you not have sharpened?
must he not have sharpened?
must we not have sharpened?
must you not have sharpened?
must they not have sharpened? 	must I not have been sharpening?
must you not have been sharpening?
must he not have been sharpening?
must we not have been sharpening?
must you not have been sharpening?
must they not have been sharpening?