I can buzz you can buzz he can buzz we can buzz you can buzz they can buzz
V-ing form
I can be buzzing you can be buzzing he can be buzzing we can be buzzing you can be buzzing they can be buzzing
Perfect
I can have buzzed you can have buzzed he can have buzzed we can have buzzed you can have buzzed they can have buzzed
V-ing perfect
I can have been buzzing you can have been buzzing he can have been buzzing we can have been buzzing you can have been buzzing they can have been buzzing
Negation
Simple form
I can't buzz you can't buzz he can't buzz we can't buzz you can't buzz they can't buzz
V-ing form
I can't be buzzing you can't be buzzing he can't be buzzing we can't be buzzing you can't be buzzing they can't be buzzing
Perfect
I can't have buzzed you can't have buzzed he can't have buzzed we can't have buzzed you can't have buzzed they can't have buzzed
V-ing perfect
I can't have been buzzing you can't have been buzzing he can't have been buzzing we can't have been buzzing you can't have been buzzing they can't have been buzzing
Interrogative form
Simple form
can I buzz? can you buzz? can he buzz? can we buzz? can you buzz? can they buzz?
V-ing form
can I be buzzing? can you be buzzing? can he be buzzing? can we be buzzing? can you be buzzing? can they be buzzing?
Perfect
can I have buzzed? can you have buzzed? can he have buzzed? can we have buzzed? can you have buzzed? can they have buzzed?
V-ing perfect
can I have been buzzing? can you have been buzzing? can he have been buzzing? can we have been buzzing? can you have been buzzing? can they have been buzzing?
Interro-negative form
Simple form
can't I buzz? can't you buzz? can't he buzz? can't we buzz? can't you buzz? can't they buzz?
V-ing form
can't I be buzzing? can't you be buzzing? can't he be buzzing? can't we be buzzing? can't you be buzzing? can't they be buzzing?
Perfect
can't I have buzzed? can't you have buzzed? can't he have buzzed? can't we have buzzed? can't you have buzzed? can't they have buzzed?
V-ing perfect
can't I have been buzzing? can't you have been buzzing? can't he have been buzzing? can't we have been buzzing? can't you have been buzzing? can't they have been buzzing?