I can gabble you can gabble he can gabble we can gabble you can gabble they can gabble
V-ing form
I can be gabbling you can be gabbling he can be gabbling we can be gabbling you can be gabbling they can be gabbling
Perfect
I can have gabbled you can have gabbled he can have gabbled we can have gabbled you can have gabbled they can have gabbled
V-ing perfect
I can have been gabbling you can have been gabbling he can have been gabbling we can have been gabbling you can have been gabbling they can have been gabbling
Negation
Simple form
I can't gabble you can't gabble he can't gabble we can't gabble you can't gabble they can't gabble
V-ing form
I can't be gabbling you can't be gabbling he can't be gabbling we can't be gabbling you can't be gabbling they can't be gabbling
Perfect
I can't have gabbled you can't have gabbled he can't have gabbled we can't have gabbled you can't have gabbled they can't have gabbled
V-ing perfect
I can't have been gabbling you can't have been gabbling he can't have been gabbling we can't have been gabbling you can't have been gabbling they can't have been gabbling
Interrogative form
Simple form
can I gabble? can you gabble? can he gabble? can we gabble? can you gabble? can they gabble?
V-ing form
can I be gabbling? can you be gabbling? can he be gabbling? can we be gabbling? can you be gabbling? can they be gabbling?
Perfect
can I have gabbled? can you have gabbled? can he have gabbled? can we have gabbled? can you have gabbled? can they have gabbled?
V-ing perfect
can I have been gabbling? can you have been gabbling? can he have been gabbling? can we have been gabbling? can you have been gabbling? can they have been gabbling?
Interro-negative form
Simple form
can't I gabble? can't you gabble? can't he gabble? can't we gabble? can't you gabble? can't they gabble?
V-ing form
can't I be gabbling? can't you be gabbling? can't he be gabbling? can't we be gabbling? can't you be gabbling? can't they be gabbling?
Perfect
can't I have gabbled? can't you have gabbled? can't he have gabbled? can't we have gabbled? can't you have gabbled? can't they have gabbled?
V-ing perfect
can't I have been gabbling? can't you have been gabbling? can't he have been gabbling? can't we have been gabbling? can't you have been gabbling? can't they have been gabbling?