English verb conjugation
CAN DESIGN

Regular verb: design - designed - designed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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