English verb conjugation
MUST DESIGN

Regular verb: design - designed - designed

Affirmation

Simple form	V-ing form
I must design you must design he must design we must design you must design they must design	I must be designing you must be designing he must be designing we must be designing you must be designing they must be designing
Perfect	V-ing perfect
I must have designed you must have designed he must have designed we must have designed you must have designed they must have designed	I must have been designing you must have been designing he must have been designing we must have been designing you must have been designing they must have been designing

Negation

Simple form	V-ing form
I mustn't design you mustn't design he mustn't design we mustn't design you mustn't design they mustn't design	I mustn't be designing you mustn't be designing he mustn't be designing we mustn't be designing you mustn't be designing they mustn't be designing
Perfect	V-ing perfect
I mustn't have designed you mustn't have designed he mustn't have designed we mustn't have designed you mustn't have designed they mustn't have designed	I mustn't have been designing you mustn't have been designing he mustn't have been designing we mustn't have been designing you mustn't have been designing they mustn't have been designing

Interrogative form

Simple form	V-ing form
must I design? must you design? must he design? must we design? must you design? must they design?	must I be designing? must you be designing? must he be designing? must we be designing? must you be designing? must they be designing?
Perfect	V-ing perfect
must I have designed? must you have designed? must he have designed? must we have designed? must you have designed? must they have designed?	must I have been designing? must you have been designing? must he have been designing? must we have been designing? must you have been designing? must they have been designing?

Interro-negative form

Simple form	V-ing form
mustn't I design? mustn't you design? mustn't he design? mustn't we design? mustn't you design? mustn't they design?	mustn't I be designing? mustn't you be designing? mustn't he be designing? mustn't we be designing? mustn't you be designing? mustn't they be designing?
Perfect	V-ing perfect
mustn't I have designed? mustn't you have designed? mustn't he have designed? mustn't we have designed? mustn't you have designed? mustn't they have designed?	mustn't I have been designing? mustn't you have been designing? mustn't he have been designing? mustn't we have been designing? mustn't you have been designing? mustn't they have been designing?