can bark
Regular verb: bark - barked- barked

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