I can babble you can babble he can babble we can babble you can babble they can babble
V-ing form
I can be babbling you can be babbling he can be babbling we can be babbling you can be babbling they can be babbling
Perfect
I can have babbled you can have babbled he can have babbled we can have babbled you can have babbled they can have babbled
V-ing perfect
I can have been babbling you can have been babbling he can have been babbling we can have been babbling you can have been babbling they can have been babbling
Negation
Simple form
I can't babble you can't babble he can't babble we can't babble you can't babble they can't babble
V-ing form
I can't be babbling you can't be babbling he can't be babbling we can't be babbling you can't be babbling they can't be babbling
Perfect
I can't have babbled you can't have babbled he can't have babbled we can't have babbled you can't have babbled they can't have babbled
V-ing perfect
I can't have been babbling you can't have been babbling he can't have been babbling we can't have been babbling you can't have been babbling they can't have been babbling
Interrogative form
Simple form
can I babble? can you babble? can he babble? can we babble? can you babble? can they babble?
V-ing form
can I be babbling? can you be babbling? can he be babbling? can we be babbling? can you be babbling? can they be babbling?
Perfect
can I have babbled? can you have babbled? can he have babbled? can we have babbled? can you have babbled? can they have babbled?
V-ing perfect
can I have been babbling? can you have been babbling? can he have been babbling? can we have been babbling? can you have been babbling? can they have been babbling?
Interro-negative form
Simple form
can't I babble? can't you babble? can't he babble? can't we babble? can't you babble? can't they babble?
V-ing form
can't I be babbling? can't you be babbling? can't he be babbling? can't we be babbling? can't you be babbling? can't they be babbling?
Perfect
can't I have babbled? can't you have babbled? can't he have babbled? can't we have babbled? can't you have babbled? can't they have babbled?
V-ing perfect
can't I have been babbling? can't you have been babbling? can't he have been babbling? can't we have been babbling? can't you have been babbling? can't they have been babbling?