I could breathalyse you could breathalyse he could breathalyse we could breathalyse you could breathalyse they could breathalyse
V-ing form
I could be breathalysing you could be breathalysing he could be breathalysing we could be breathalysing you could be breathalysing they could be breathalysing
Perfect
I could have breathalysed you could have breathalysed he could have breathalysed we could have breathalysed you could have breathalysed they could have breathalysed
V-ing perfect
I could have been breathalysing you could have been breathalysing he could have been breathalysing we could have been breathalysing you could have been breathalysing they could have been breathalysing
Negation
Simple form
I could not breathalyse you could not breathalyse he could not breathalyse we could not breathalyse you could not breathalyse they could not breathalyse
V-ing form
I could not be breathalysing you could not be breathalysing he could not be breathalysing we could not be breathalysing you could not be breathalysing they could not be breathalysing
Perfect
I could not have breathalysed you could not have breathalysed he could not have breathalysed we could not have breathalysed you could not have breathalysed they could not have breathalysed
V-ing perfect
I could not have been breathalysing you could not have been breathalysing he could not have been breathalysing we could not have been breathalysing you could not have been breathalysing they could not have been breathalysing
Interrogative form
Simple form
could I breathalyse? could you breathalyse? could he breathalyse? could we breathalyse? could you breathalyse? could they breathalyse?
V-ing form
could I be breathalysing? could you be breathalysing? could he be breathalysing? could we be breathalysing? could you be breathalysing? could they be breathalysing?
Perfect
could I have breathalysed? could you have breathalysed? could he have breathalysed? could we have breathalysed? could you have breathalysed? could they have breathalysed?
V-ing perfect
could I have been breathalysing? could you have been breathalysing? could he have been breathalysing? could we have been breathalysing? could you have been breathalysing? could they have been breathalysing?
Interro-negative form
Simple form
could I not breathalyse? could you not breathalyse? could he not breathalyse? could we not breathalyse? could you not breathalyse? could they not breathalyse?
V-ing form
could I not be breathalysing? could you not be breathalysing? could he not be breathalysing? could we not be breathalysing? could you not be breathalysing? could they not be breathalysing?
Perfect
could I not have breathalysed? could you not have breathalysed? could he not have breathalysed? could we not have breathalysed? could you not have breathalysed? could they not have breathalysed?
V-ing perfect
could I not have been breathalysing? could you not have been breathalysing? could he not have been breathalysing? could we not have been breathalysing? could you not have been breathalysing? could they not have been breathalysing?