I can baa you can baa he can baa we can baa you can baa they can baa
V-ing form
I can be baaing you can be baaing he can be baaing we can be baaing you can be baaing they can be baaing
Perfect
I can have baaed you can have baaed he can have baaed we can have baaed you can have baaed they can have baaed
V-ing perfect
I can have been baaing you can have been baaing he can have been baaing we can have been baaing you can have been baaing they can have been baaing
Negation
Simple form
I cannot baa you cannot baa he cannot baa we cannot baa you cannot baa they cannot baa
V-ing form
I cannot be baaing you cannot be baaing he cannot be baaing we cannot be baaing you cannot be baaing they cannot be baaing
Perfect
I cannot have baaed you cannot have baaed he cannot have baaed we cannot have baaed you cannot have baaed they cannot have baaed
V-ing perfect
I cannot have been baaing you cannot have been baaing he cannot have been baaing we cannot have been baaing you cannot have been baaing they cannot have been baaing
Interrogative form
Simple form
can I baa? can you baa? can he baa? can we baa? can you baa? can they baa?
V-ing form
can I be baaing? can you be baaing? can he be baaing? can we be baaing? can you be baaing? can they be baaing?
Perfect
can I have baaed? can you have baaed? can he have baaed? can we have baaed? can you have baaed? can they have baaed?
V-ing perfect
can I have been baaing? can you have been baaing? can he have been baaing? can we have been baaing? can you have been baaing? can they have been baaing?
Interro-negative form
Simple form
can I not baa? can you not baa? can he not baa? can we not baa? can you not baa? can they not baa?
V-ing form
can I not be baaing? can you not be baaing? can he not be baaing? can we not be baaing? can you not be baaing? can they not be baaing?
Perfect
can I not have baaed? can you not have baaed? can he not have baaed? can we not have baaed? can you not have baaed? can they not have baaed?
V-ing perfect
can I not have been baaing? can you not have been baaing? can he not have been baaing? can we not have been baaing? can you not have been baaing? can they not have been baaing?