I can bs you can bs she can bs we can bs you can bs they can bs
V-ing form
I can be bsing you can be bsing she can be bsing we can be bsing you can be bsing they can be bsing
Perfect
I can have bsed you can have bsed she can have bsed we can have bsed you can have bsed they can have bsed
V-ing perfect
I can have been bsing you can have been bsing she can have been bsing we can have been bsing you can have been bsing they can have been bsing
Negation
Simple form
I can't bs you can't bs she can't bs we can't bs you can't bs they can't bs
V-ing form
I can't be bsing you can't be bsing she can't be bsing we can't be bsing you can't be bsing they can't be bsing
Perfect
I can't have bsed you can't have bsed she can't have bsed we can't have bsed you can't have bsed they can't have bsed
V-ing perfect
I can't have been bsing you can't have been bsing she can't have been bsing we can't have been bsing you can't have been bsing they can't have been bsing
Interrogative form
Simple form
can I bs? can you bs? can she bs? can we bs? can you bs? can they bs?
V-ing form
can I be bsing? can you be bsing? can she be bsing? can we be bsing? can you be bsing? can they be bsing?
Perfect
can I have bsed? can you have bsed? can she have bsed? can we have bsed? can you have bsed? can they have bsed?
V-ing perfect
can I have been bsing? can you have been bsing? can she have been bsing? can we have been bsing? can you have been bsing? can they have been bsing?
Interro-negative form
Simple form
can't I bs? can't you bs? can't she bs? can't we bs? can't you bs? can't they bs?
V-ing form
can't I be bsing? can't you be bsing? can't she be bsing? can't we be bsing? can't you be bsing? can't they be bsing?
Perfect
can't I have bsed? can't you have bsed? can't she have bsed? can't we have bsed? can't you have bsed? can't they have bsed?
V-ing perfect
can't I have been bsing? can't you have been bsing? can't she have been bsing? can't we have been bsing? can't you have been bsing? can't they have been bsing?