English verb conjugation
MUST CUBE

Regular verb: cube - cubed - cubed

Affirmation

Simple form	V-ing form
I must cube you must cube he must cube we must cube you must cube they must cube	I must be cubing you must be cubing he must be cubing we must be cubing you must be cubing they must be cubing
Perfect	V-ing perfect
I must have cubed you must have cubed he must have cubed we must have cubed you must have cubed they must have cubed	I must have been cubing you must have been cubing he must have been cubing we must have been cubing you must have been cubing they must have been cubing

Negation

Simple form	V-ing form
I mustn't cube you mustn't cube he mustn't cube we mustn't cube you mustn't cube they mustn't cube	I mustn't be cubing you mustn't be cubing he mustn't be cubing we mustn't be cubing you mustn't be cubing they mustn't be cubing
Perfect	V-ing perfect
I mustn't have cubed you mustn't have cubed he mustn't have cubed we mustn't have cubed you mustn't have cubed they mustn't have cubed	I mustn't have been cubing you mustn't have been cubing he mustn't have been cubing we mustn't have been cubing you mustn't have been cubing they mustn't have been cubing

Interrogative form

Simple form	V-ing form
must I cube? must you cube? must he cube? must we cube? must you cube? must they cube?	must I be cubing? must you be cubing? must he be cubing? must we be cubing? must you be cubing? must they be cubing?
Perfect	V-ing perfect
must I have cubed? must you have cubed? must he have cubed? must we have cubed? must you have cubed? must they have cubed?	must I have been cubing? must you have been cubing? must he have been cubing? must we have been cubing? must you have been cubing? must they have been cubing?

Interro-negative form

Simple form	V-ing form
mustn't I cube? mustn't you cube? mustn't he cube? mustn't we cube? mustn't you cube? mustn't they cube?	mustn't I be cubing? mustn't you be cubing? mustn't he be cubing? mustn't we be cubing? mustn't you be cubing? mustn't they be cubing?
Perfect	V-ing perfect
mustn't I have cubed? mustn't you have cubed? mustn't he have cubed? mustn't we have cubed? mustn't you have cubed? mustn't they have cubed?	mustn't I have been cubing? mustn't you have been cubing? mustn't he have been cubing? mustn't we have been cubing? mustn't you have been cubing? mustn't they have been cubing?