I can scribble you can scribble he can scribble we can scribble you can scribble they can scribble
V-ing form
I can be scribbling you can be scribbling he can be scribbling we can be scribbling you can be scribbling they can be scribbling
Perfect
I can have scribbled you can have scribbled he can have scribbled we can have scribbled you can have scribbled they can have scribbled
V-ing perfect
I can have been scribbling you can have been scribbling he can have been scribbling we can have been scribbling you can have been scribbling they can have been scribbling
Negation
Simple form
I can't scribble you can't scribble he can't scribble we can't scribble you can't scribble they can't scribble
V-ing form
I can't be scribbling you can't be scribbling he can't be scribbling we can't be scribbling you can't be scribbling they can't be scribbling
Perfect
I can't have scribbled you can't have scribbled he can't have scribbled we can't have scribbled you can't have scribbled they can't have scribbled
V-ing perfect
I can't have been scribbling you can't have been scribbling he can't have been scribbling we can't have been scribbling you can't have been scribbling they can't have been scribbling
Interrogative form
Simple form
can I scribble? can you scribble? can he scribble? can we scribble? can you scribble? can they scribble?
V-ing form
can I be scribbling? can you be scribbling? can he be scribbling? can we be scribbling? can you be scribbling? can they be scribbling?
Perfect
can I have scribbled? can you have scribbled? can he have scribbled? can we have scribbled? can you have scribbled? can they have scribbled?
V-ing perfect
can I have been scribbling? can you have been scribbling? can he have been scribbling? can we have been scribbling? can you have been scribbling? can they have been scribbling?
Interro-negative form
Simple form
can't I scribble? can't you scribble? can't he scribble? can't we scribble? can't you scribble? can't they scribble?
V-ing form
can't I be scribbling? can't you be scribbling? can't he be scribbling? can't we be scribbling? can't you be scribbling? can't they be scribbling?
Perfect
can't I have scribbled? can't you have scribbled? can't he have scribbled? can't we have scribbled? can't you have scribbled? can't they have scribbled?
V-ing perfect
can't I have been scribbling? can't you have been scribbling? can't he have been scribbling? can't we have been scribbling? can't you have been scribbling? can't they have been scribbling?