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 cannot bus you cannot bus he cannot bus we cannot bus you cannot bus they cannot bus
V-ing form
I cannot be bussing you cannot be bussing he cannot be bussing we cannot be bussing you cannot be bussing they cannot be bussing
Perfect
I cannot have bussed you cannot have bussed he cannot have bussed we cannot have bussed you cannot have bussed they cannot have bussed
V-ing perfect
I cannot have been bussing you cannot have been bussing he cannot have been bussing we cannot have been bussing you cannot have been bussing they cannot 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 I not bus? can you not bus? can he not bus? can we not bus? can you not bus? can they not bus?
V-ing form
can I not be bussing? can you not be bussing? can he not be bussing? can we not be bussing? can you not be bussing? can they not be bussing?
Perfect
can I not have bussed? can you not have bussed? can he not have bussed? can we not have bussed? can you not have bussed? can they not have bussed?
V-ing perfect
can I not have been bussing? can you not have been bussing? can he not have been bussing? can we not have been bussing? can you not have been bussing? can they not have been bussing?