can hark
Regular verb: hark - harked- harked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can hark
you can hark
he can hark
we can hark
you can hark
they can hark 	I can be harking
you can be harking
he can be harking
we can be harking
you can be harking
they can be harking	I can have harked
you can have harked
he can have harked
we can have harked
you can have harked
they can have harked	I can have been harking
you can have been harking
he can have been harking
we can have been harking
you can have been harking
they can have been harking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't hark
you can't hark
he can't hark
we can't hark
you can't hark
they can't hark 	I can't be harking
you can't be harking
he can't be harking
we can't be harking
you can't be harking
they can't be harking	I can't have harked
you can't have harked
he can't have harked
we can't have harked
you can't have harked
they can't have harked	I can't have been harking
you can't have been harking
he can't have been harking
we can't have been harking
you can't have been harking
they can't have been harking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I hark?
can you hark?
can he hark?
can we hark?
can you hark?
can they hark? 	can I be harking?
can you be harking?
can he be harking?
can we be harking?
can you be harking?
can they be harking? 	can I have harked?
can you have harked?
can he have harked?
can we have harked?
can you have harked?
can they have harked? 	can I have been harking?
can you have been harking?
can he have been harking?
can we have been harking?
can you have been harking?
can they have been harking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I hark?
can't you hark?
can't he hark?
can't we hark?
can't you hark?
can't they hark? 	can't I be harking?
can't you be harking?
can't he be harking?
can't we be harking?
can't you be harking?
can't they be harking? 	can't I have harked?
can't you have harked?
can't he have harked?
can't we have harked?
can't you have harked?
can't they have harked? 	can't I have been harking?
can't you have been harking?
can't he have been harking?
can't we have been harking?
can't you have been harking?
can't they have been harking?