English verb conjugation
CAN BARK

Regular verb: bark - barked - barked

Affirmation

Simple form	V-ing form
I can bark you can bark he can bark we can bark you can bark they can bark	I can be barking you can be barking he can be barking we can be barking you can be barking they can be barking
Perfect	V-ing perfect
I can have barked you can have barked he can have barked we can have barked you can have barked they can have barked	I can have been barking you can have been barking he can have been barking we can have been barking you can have been barking they can have been barking

Negation

Simple form	V-ing form
I can't bark you can't bark he can't bark we can't bark you can't bark they can't bark	I can't be barking you can't be barking he can't be barking we can't be barking you can't be barking they can't be barking
Perfect	V-ing perfect
I can't have barked you can't have barked he can't have barked we can't have barked you can't have barked they can't have barked	I can't have been barking you can't have been barking he can't have been barking we can't have been barking you can't have been barking they can't have been barking

Interrogative form

Simple form	V-ing form
can I bark? can you bark? can he bark? can we bark? can you bark? can they bark?	can I be barking? can you be barking? can he be barking? can we be barking? can you be barking? can they be barking?
Perfect	V-ing perfect
can I have barked? can you have barked? can he have barked? can we have barked? can you have barked? can they have barked?	can I have been barking? can you have been barking? can he have been barking? can we have been barking? can you have been barking? can they have been barking?

Interro-negative form

Simple form	V-ing form
can't I bark? can't you bark? can't he bark? can't we bark? can't you bark? can't they bark?	can't I be barking? can't you be barking? can't he be barking? can't we be barking? can't you be barking? can't they be barking?
Perfect	V-ing perfect
can't I have barked? can't you have barked? can't he have barked? can't we have barked? can't you have barked? can't they have barked?	can't I have been barking? can't you have been barking? can't he have been barking? can't we have been barking? can't you have been barking? can't they have been barking?