I can bus you can bus he can bus we can bus you can bus they can bus
V-ing form
I can be bussing you can be bussing he can be bussing we can be bussing you can be bussing they can be bussing
Perfect
I can have bussed you can have bussed he can have bussed we can have bussed you can have bussed they can have bussed
V-ing perfect
I can have been bussing you can have been bussing he can have been bussing we can have been bussing you can have been bussing they can have been bussing
Negation
Simple form
I can't bus you can't bus he can't bus we can't bus you can't bus they can't bus
V-ing form
I can't be bussing you can't be bussing he can't be bussing we can't be bussing you can't be bussing they can't be bussing
Perfect
I can't have bussed you can't have bussed he can't have bussed we can't have bussed you can't have bussed they can't have bussed
V-ing perfect
I can't have been bussing you can't have been bussing he can't have been bussing we can't have been bussing you can't have been bussing they can't have been bussing
Interrogative form
Simple form
can I bus? can you bus? can he bus? can we bus? can you bus? can they bus?
V-ing form
can I be bussing? can you be bussing? can he be bussing? can we be bussing? can you be bussing? can they be bussing?
Perfect
can I have bussed? can you have bussed? can he have bussed? can we have bussed? can you have bussed? can they have bussed?
V-ing perfect
can I have been bussing? can you have been bussing? can he have been bussing? can we have been bussing? can you have been bussing? can they have been bussing?
Interro-negative form
Simple form
can't I bus? can't you bus? can't he bus? can't we bus? can't you bus? can't they bus?
V-ing form
can't I be bussing? can't you be bussing? can't he be bussing? can't we be bussing? can't you be bussing? can't they be bussing?
Perfect
can't I have bussed? can't you have bussed? can't he have bussed? can't we have bussed? can't you have bussed? can't they have bussed?
V-ing perfect
can't I have been bussing? can't you have been bussing? can't he have been bussing? can't we have been bussing? can't you have been bussing? can't they have been bussing?