I can bark you can bark she can bark we can bark you can bark they can bark
V-ing form
I can be barking you can be barking she can be barking we can be barking you can be barking they can be barking
Perfect
I can have barked you can have barked she can have barked we can have barked you can have barked they can have barked
V-ing perfect
I can have been barking you can have been barking she can have been barking we can have been barking you can have been barking they can have been barking
Negation
Simple form
I cannot bark you cannot bark she cannot bark we cannot bark you cannot bark they cannot bark
V-ing form
I cannot be barking you cannot be barking she cannot be barking we cannot be barking you cannot be barking they cannot be barking
Perfect
I cannot have barked you cannot have barked she cannot have barked we cannot have barked you cannot have barked they cannot have barked
V-ing perfect
I cannot have been barking you cannot have been barking she cannot have been barking we cannot have been barking you cannot have been barking they cannot have been barking
Interrogative form
Simple form
can I bark? can you bark? can she bark? can we bark? can you bark? can they bark?
V-ing form
can I be barking? can you be barking? can she be barking? can we be barking? can you be barking? can they be barking?
Perfect
can I have barked? can you have barked? can she have barked? can we have barked? can you have barked? can they have barked?
V-ing perfect
can I have been barking? can you have been barking? can she have been barking? can we have been barking? can you have been barking? can they have been barking?
Interro-negative form
Simple form
can I not bark? can you not bark? can she not bark? can we not bark? can you not bark? can they not bark?
V-ing form
can I not be barking? can you not be barking? can she not be barking? can we not be barking? can you not be barking? can they not be barking?
Perfect
can I not have barked? can you not have barked? can she not have barked? can we not have barked? can you not have barked? can they not have barked?
V-ing perfect
can I not have been barking? can you not have been barking? can she not have been barking? can we not have been barking? can you not have been barking? can they not have been barking?