could hark
Regular verb: hark - harked- harked

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

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

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

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