English verb conjugation
MUST DESIGN

Regular verb: design - designed - designed

Affirmation

Simple form	V-ing form
I must design you must design she must design we must design you must design they must design	I must be designing you must be designing she 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 she 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 she 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 must not design you must not design she must not design we must not design you must not design they must not design	I must not be designing you must not be designing she must not be designing we must not be designing you must not be designing they must not be designing
Perfect	V-ing perfect
I must not have designed you must not have designed she must not have designed we must not have designed you must not have designed they must not have designed	I must not have been designing you must not have been designing she must not have been designing we must not have been designing you must not have been designing they must not have been designing

Interrogative form

Simple form	V-ing form
must I design? must you design? must she design? must we design? must you design? must they design?	must I be designing? must you be designing? must she 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 she 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 she 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
must I not design? must you not design? must she not design? must we not design? must you not design? must they not design?	must I not be designing? must you not be designing? must she not be designing? must we not be designing? must you not be designing? must they not be designing?
Perfect	V-ing perfect
must I not have designed? must you not have designed? must she not have designed? must we not have designed? must you not have designed? must they not have designed?	must I not have been designing? must you not have been designing? must she not have been designing? must we not have been designing? must you not have been designing? must they not have been designing?