English verb conjugation
MUST PRESHARPEN

Regular verb: presharpen - presharpened - presharpened

Affirmation

Simple form	V-ing form
I must presharpen you must presharpen he must presharpen we must presharpen you must presharpen they must presharpen	I must be presharpening you must be presharpening he must be presharpening we must be presharpening you must be presharpening they must be presharpening
Perfect	V-ing perfect
I must have presharpened you must have presharpened he must have presharpened we must have presharpened you must have presharpened they must have presharpened	I must have been presharpening you must have been presharpening he must have been presharpening we must have been presharpening you must have been presharpening they must have been presharpening

Negation

Simple form	V-ing form
I must not presharpen you must not presharpen he must not presharpen we must not presharpen you must not presharpen they must not presharpen	I must not be presharpening you must not be presharpening he must not be presharpening we must not be presharpening you must not be presharpening they must not be presharpening
Perfect	V-ing perfect
I must not have presharpened you must not have presharpened he must not have presharpened we must not have presharpened you must not have presharpened they must not have presharpened	I must not have been presharpening you must not have been presharpening he must not have been presharpening we must not have been presharpening you must not have been presharpening they must not have been presharpening

Interrogative form

Simple form	V-ing form
must I presharpen? must you presharpen? must he presharpen? must we presharpen? must you presharpen? must they presharpen?	must I be presharpening? must you be presharpening? must he be presharpening? must we be presharpening? must you be presharpening? must they be presharpening?
Perfect	V-ing perfect
must I have presharpened? must you have presharpened? must he have presharpened? must we have presharpened? must you have presharpened? must they have presharpened?	must I have been presharpening? must you have been presharpening? must he have been presharpening? must we have been presharpening? must you have been presharpening? must they have been presharpening?

Interro-negative form

Simple form	V-ing form
must I not presharpen? must you not presharpen? must he not presharpen? must we not presharpen? must you not presharpen? must they not presharpen?	must I not be presharpening? must you not be presharpening? must he not be presharpening? must we not be presharpening? must you not be presharpening? must they not be presharpening?
Perfect	V-ing perfect
must I not have presharpened? must you not have presharpened? must he not have presharpened? must we not have presharpened? must you not have presharpened? must they not have presharpened?	must I not have been presharpening? must you not have been presharpening? must he not have been presharpening? must we not have been presharpening? must you not have been presharpening? must they not have been presharpening?