English verb conjugation
COULD BS

Regular verb: bs - bsed - bsed

Affirmation

Simple form	V-ing form
I could bs you could bs he could bs we could bs you could bs they could bs	I could be bsing you could be bsing he could be bsing we could be bsing you could be bsing they could be bsing
Perfect	V-ing perfect
I could have bsed you could have bsed he could have bsed we could have bsed you could have bsed they could have bsed	I could have been bsing you could have been bsing he could have been bsing we could have been bsing you could have been bsing they could have been bsing

Negation

Simple form	V-ing form
I could not bs you could not bs he could not bs we could not bs you could not bs they could not bs	I could not be bsing you could not be bsing he could not be bsing we could not be bsing you could not be bsing they could not be bsing
Perfect	V-ing perfect
I could not have bsed you could not have bsed he could not have bsed we could not have bsed you could not have bsed they could not have bsed	I could not have been bsing you could not have been bsing he could not have been bsing we could not have been bsing you could not have been bsing they could not have been bsing

Interrogative form

Simple form	V-ing form
could I bs? could you bs? could he bs? could we bs? could you bs? could they bs?	could I be bsing? could you be bsing? could he be bsing? could we be bsing? could you be bsing? could they be bsing?
Perfect	V-ing perfect
could I have bsed? could you have bsed? could he have bsed? could we have bsed? could you have bsed? could they have bsed?	could I have been bsing? could you have been bsing? could he have been bsing? could we have been bsing? could you have been bsing? could they have been bsing?

Interro-negative form

Simple form	V-ing form
could I not bs? could you not bs? could he not bs? could we not bs? could you not bs? could they not bs?	could I not be bsing? could you not be bsing? could he not be bsing? could we not be bsing? could you not be bsing? could they not be bsing?
Perfect	V-ing perfect
could I not have bsed? could you not have bsed? could he not have bsed? could we not have bsed? could you not have bsed? could they not have bsed?	could I not have been bsing? could you not have been bsing? could he not have been bsing? could we not have been bsing? could you not have been bsing? could they not have been bsing?