could breathalyze
Regular verb: breathalyze - breathalyzed- breathalyzed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could breathalyze
you could breathalyze
he could breathalyze
we could breathalyze
you could breathalyze
they could breathalyze 	I could be breathalyzing
you could be breathalyzing
he could be breathalyzing
we could be breathalyzing
you could be breathalyzing
they could be breathalyzing	I could have breathalyzed
you could have breathalyzed
he could have breathalyzed
we could have breathalyzed
you could have breathalyzed
they could have breathalyzed	I could have been breathalyzing
you could have been breathalyzing
he could have been breathalyzing
we could have been breathalyzing
you could have been breathalyzing
they could have been breathalyzing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't breathalyze
you couldn't breathalyze
he couldn't breathalyze
we couldn't breathalyze
you couldn't breathalyze
they couldn't breathalyze 	I couldn't be breathalyzing
you couldn't be breathalyzing
he couldn't be breathalyzing
we couldn't be breathalyzing
you couldn't be breathalyzing
they couldn't be breathalyzing	I couldn't have breathalyzed
you couldn't have breathalyzed
he couldn't have breathalyzed
we couldn't have breathalyzed
you couldn't have breathalyzed
they couldn't have breathalyzed	I couldn't have been breathalyzing
you couldn't have been breathalyzing
he couldn't have been breathalyzing
we couldn't have been breathalyzing
you couldn't have been breathalyzing
they couldn't have been breathalyzing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I breathalyze?
could you breathalyze?
could he breathalyze?
could we breathalyze?
could you breathalyze?
could they breathalyze? 	could I be breathalyzing?
could you be breathalyzing?
could he be breathalyzing?
could we be breathalyzing?
could you be breathalyzing?
could they be breathalyzing? 	could I have breathalyzed?
could you have breathalyzed?
could he have breathalyzed?
could we have breathalyzed?
could you have breathalyzed?
could they have breathalyzed? 	could I have been breathalyzing?
could you have been breathalyzing?
could he have been breathalyzing?
could we have been breathalyzing?
could you have been breathalyzing?
could they have been breathalyzing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I breathalyze?
couldn't you breathalyze?
couldn't he breathalyze?
couldn't we breathalyze?
couldn't you breathalyze?
couldn't they breathalyze? 	couldn't I be breathalyzing?
couldn't you be breathalyzing?
couldn't he be breathalyzing?
couldn't we be breathalyzing?
couldn't you be breathalyzing?
couldn't they be breathalyzing? 	couldn't I have breathalyzed?
couldn't you have breathalyzed?
couldn't he have breathalyzed?
couldn't we have breathalyzed?
couldn't you have breathalyzed?
couldn't they have breathalyzed? 	couldn't I have been breathalyzing?
couldn't you have been breathalyzing?
couldn't he have been breathalyzing?
couldn't we have been breathalyzing?
couldn't you have been breathalyzing?
couldn't they have been breathalyzing?