English verb conjugation
MUST VACUUM

Regular verb: vacuum - vacuumed - vacuumed

Affirmation

Simple form	V-ing form
I must vacuum you must vacuum he must vacuum we must vacuum you must vacuum they must vacuum	I must be vacuuming you must be vacuuming he 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 he 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 he 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 he 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 he 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 he 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 he 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 he vacuum? must we vacuum? must you vacuum? must they vacuum?	must I be vacuuming? must you be vacuuming? must he 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 he 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 he 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 he 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 he 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 he 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 he have been vacuuming? mustn't we have been vacuuming? mustn't you have been vacuuming? mustn't they have been vacuuming?