could nonplus
Regular verb: nonplus - nonplussed- nonplussed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could nonplus
you could nonplus
she could nonplus
we could nonplus
you could nonplus
they could nonplus 	I could be nonplussing
you could be nonplussing
she could be nonplussing
we could be nonplussing
you could be nonplussing
they could be nonplussing	I could have nonplussed
you could have nonplussed
she could have nonplussed
we could have nonplussed
you could have nonplussed
they could have nonplussed	I could have been nonplussing
you could have been nonplussing
she could have been nonplussing
we could have been nonplussing
you could have been nonplussing
they could have been nonplussing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't nonplus
you couldn't nonplus
she couldn't nonplus
we couldn't nonplus
you couldn't nonplus
they couldn't nonplus 	I couldn't be nonplussing
you couldn't be nonplussing
she couldn't be nonplussing
we couldn't be nonplussing
you couldn't be nonplussing
they couldn't be nonplussing	I couldn't have nonplussed
you couldn't have nonplussed
she couldn't have nonplussed
we couldn't have nonplussed
you couldn't have nonplussed
they couldn't have nonplussed	I couldn't have been nonplussing
you couldn't have been nonplussing
she couldn't have been nonplussing
we couldn't have been nonplussing
you couldn't have been nonplussing
they couldn't have been nonplussing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I nonplus?
could you nonplus?
could she nonplus?
could we nonplus?
could you nonplus?
could they nonplus? 	could I be nonplussing?
could you be nonplussing?
could she be nonplussing?
could we be nonplussing?
could you be nonplussing?
could they be nonplussing? 	could I have nonplussed?
could you have nonplussed?
could she have nonplussed?
could we have nonplussed?
could you have nonplussed?
could they have nonplussed? 	could I have been nonplussing?
could you have been nonplussing?
could she have been nonplussing?
could we have been nonplussing?
could you have been nonplussing?
could they have been nonplussing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I nonplus?
couldn't you nonplus?
couldn't she nonplus?
couldn't we nonplus?
couldn't you nonplus?
couldn't they nonplus? 	couldn't I be nonplussing?
couldn't you be nonplussing?
couldn't she be nonplussing?
couldn't we be nonplussing?
couldn't you be nonplussing?
couldn't they be nonplussing? 	couldn't I have nonplussed?
couldn't you have nonplussed?
couldn't she have nonplussed?
couldn't we have nonplussed?
couldn't you have nonplussed?
couldn't they have nonplussed? 	couldn't I have been nonplussing?
couldn't you have been nonplussing?
couldn't she have been nonplussing?
couldn't we have been nonplussing?
couldn't you have been nonplussing?
couldn't they have been nonplussing?