English verb conjugation
MUST HEFT

Regular verb: heft - hefted - hefted

Affirmation

Simple form	V-ing form
I must heft you must heft she must heft we must heft you must heft they must heft	I must be hefting you must be hefting she must be hefting we must be hefting you must be hefting they must be hefting
Perfect	V-ing perfect
I must have hefted you must have hefted she must have hefted we must have hefted you must have hefted they must have hefted	I must have been hefting you must have been hefting she must have been hefting we must have been hefting you must have been hefting they must have been hefting

Negation

Simple form	V-ing form
I must not heft you must not heft she must not heft we must not heft you must not heft they must not heft	I must not be hefting you must not be hefting she must not be hefting we must not be hefting you must not be hefting they must not be hefting
Perfect	V-ing perfect
I must not have hefted you must not have hefted she must not have hefted we must not have hefted you must not have hefted they must not have hefted	I must not have been hefting you must not have been hefting she must not have been hefting we must not have been hefting you must not have been hefting they must not have been hefting

Interrogative form

Simple form	V-ing form
must I heft? must you heft? must she heft? must we heft? must you heft? must they heft?	must I be hefting? must you be hefting? must she be hefting? must we be hefting? must you be hefting? must they be hefting?
Perfect	V-ing perfect
must I have hefted? must you have hefted? must she have hefted? must we have hefted? must you have hefted? must they have hefted?	must I have been hefting? must you have been hefting? must she have been hefting? must we have been hefting? must you have been hefting? must they have been hefting?

Interro-negative form

Simple form	V-ing form
must I not heft? must you not heft? must she not heft? must we not heft? must you not heft? must they not heft?	must I not be hefting? must you not be hefting? must she not be hefting? must we not be hefting? must you not be hefting? must they not be hefting?
Perfect	V-ing perfect
must I not have hefted? must you not have hefted? must she not have hefted? must we not have hefted? must you not have hefted? must they not have hefted?	must I not have been hefting? must you not have been hefting? must she not have been hefting? must we not have been hefting? must you not have been hefting? must they not have been hefting?