must design
Regular verb: design - designed- designed

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