English verb conjugation
COULD BREATHALYZE

Regular verb: breathalyze - breathalyzed - breathalyzed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I could not breathalyze you could not breathalyze he could not breathalyze we could not breathalyze you could not breathalyze they could not breathalyze	I could not be breathalyzing you could not be breathalyzing he could not be breathalyzing we could not be breathalyzing you could not be breathalyzing they could not be breathalyzing
Perfect	V-ing perfect
I could not have breathalyzed you could not have breathalyzed he could not have breathalyzed we could not have breathalyzed you could not have breathalyzed they could not have breathalyzed	I could not have been breathalyzing you could not have been breathalyzing he could not have been breathalyzing we could not have been breathalyzing you could not have been breathalyzing they could not have been breathalyzing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
could I not breathalyze? could you not breathalyze? could he not breathalyze? could we not breathalyze? could you not breathalyze? could they not breathalyze?	could I not be breathalyzing? could you not be breathalyzing? could he not be breathalyzing? could we not be breathalyzing? could you not be breathalyzing? could they not be breathalyzing?
Perfect	V-ing perfect
could I not have breathalyzed? could you not have breathalyzed? could he not have breathalyzed? could we not have breathalyzed? could you not have breathalyzed? could they not have breathalyzed?	could I not have been breathalyzing? could you not have been breathalyzing? could he not have been breathalyzing? could we not have been breathalyzing? could you not have been breathalyzing? could they not have been breathalyzing?