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 mustn't heft you mustn't heft she mustn't heft we mustn't heft you mustn't heft they mustn't heft	I mustn't be hefting you mustn't be hefting she mustn't be hefting we mustn't be hefting you mustn't be hefting they mustn't be hefting
Perfect	V-ing perfect
I mustn't have hefted you mustn't have hefted she mustn't have hefted we mustn't have hefted you mustn't have hefted they mustn't have hefted	I mustn't have been hefting you mustn't have been hefting she mustn't have been hefting we mustn't have been hefting you mustn't have been hefting they mustn't 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
mustn't I heft? mustn't you heft? mustn't she heft? mustn't we heft? mustn't you heft? mustn't they heft?	mustn't I be hefting? mustn't you be hefting? mustn't she be hefting? mustn't we be hefting? mustn't you be hefting? mustn't they be hefting?
Perfect	V-ing perfect
mustn't I have hefted? mustn't you have hefted? mustn't she have hefted? mustn't we have hefted? mustn't you have hefted? mustn't they have hefted?	mustn't I have been hefting? mustn't you have been hefting? mustn't she have been hefting? mustn't we have been hefting? mustn't you have been hefting? mustn't they have been hefting?