English verb conjugation
MUST VACUUM

Regular verb: vacuum - vacuumed - vacuumed

Affirmation

Simple form	V-ing form
I must vacuum you must vacuum she must vacuum we must vacuum you must vacuum they must vacuum	I must be vacuuming you must be vacuuming she must be vacuuming we must be vacuuming you must be vacuuming they must be vacuuming
Perfect	V-ing perfect
I must have vacuumed you must have vacuumed she must have vacuumed we must have vacuumed you must have vacuumed they must have vacuumed	I must have been vacuuming you must have been vacuuming she must have been vacuuming we must have been vacuuming you must have been vacuuming they must have been vacuuming

Negation

Simple form	V-ing form
I mustn't vacuum you mustn't vacuum she mustn't vacuum we mustn't vacuum you mustn't vacuum they mustn't vacuum	I mustn't be vacuuming you mustn't be vacuuming she mustn't be vacuuming we mustn't be vacuuming you mustn't be vacuuming they mustn't be vacuuming
Perfect	V-ing perfect
I mustn't have vacuumed you mustn't have vacuumed she mustn't have vacuumed we mustn't have vacuumed you mustn't have vacuumed they mustn't have vacuumed	I mustn't have been vacuuming you mustn't have been vacuuming she mustn't have been vacuuming we mustn't have been vacuuming you mustn't have been vacuuming they mustn't have been vacuuming

Interrogative form

Simple form	V-ing form
must I vacuum? must you vacuum? must she vacuum? must we vacuum? must you vacuum? must they vacuum?	must I be vacuuming? must you be vacuuming? must she be vacuuming? must we be vacuuming? must you be vacuuming? must they be vacuuming?
Perfect	V-ing perfect
must I have vacuumed? must you have vacuumed? must she have vacuumed? must we have vacuumed? must you have vacuumed? must they have vacuumed?	must I have been vacuuming? must you have been vacuuming? must she have been vacuuming? must we have been vacuuming? must you have been vacuuming? must they have been vacuuming?

Interro-negative form

Simple form	V-ing form
mustn't I vacuum? mustn't you vacuum? mustn't she vacuum? mustn't we vacuum? mustn't you vacuum? mustn't they vacuum?	mustn't I be vacuuming? mustn't you be vacuuming? mustn't she be vacuuming? mustn't we be vacuuming? mustn't you be vacuuming? mustn't they be vacuuming?
Perfect	V-ing perfect
mustn't I have vacuumed? mustn't you have vacuumed? mustn't she have vacuumed? mustn't we have vacuumed? mustn't you have vacuumed? mustn't they have vacuumed?	mustn't I have been vacuuming? mustn't you have been vacuuming? mustn't she have been vacuuming? mustn't we have been vacuuming? mustn't you have been vacuuming? mustn't they have been vacuuming?