could design
Regular verb: design - designed- designed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could design
you could design
she could design
we could design
you could design
they could design 	I could be designing
you could be designing
she could be designing
we could be designing
you could be designing
they could be designing	I could have designed
you could have designed
she could have designed
we could have designed
you could have designed
they could have designed	I could have been designing
you could have been designing
she could have been designing
we could have been designing
you could have been designing
they could have been designing	

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

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I design?
could you design?
could she design?
could we design?
could you design?
could they design? 	could I be designing?
could you be designing?
could she be designing?
could we be designing?
could you be designing?
could they be designing? 	could I have designed?
could you have designed?
could she have designed?
could we have designed?
could you have designed?
could they have designed? 	could I have been designing?
could you have been designing?
could she have been designing?
could we have been designing?
could you have been designing?
could they have been designing? 	

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