could harpoon
Regular verb: harpoon - harpooned- harpooned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could harpoon
you could harpoon
he could harpoon
we could harpoon
you could harpoon
they could harpoon 	I could be harpooning
you could be harpooning
he could be harpooning
we could be harpooning
you could be harpooning
they could be harpooning	I could have harpooned
you could have harpooned
he could have harpooned
we could have harpooned
you could have harpooned
they could have harpooned	I could have been harpooning
you could have been harpooning
he could have been harpooning
we could have been harpooning
you could have been harpooning
they could have been harpooning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't harpoon
you couldn't harpoon
he couldn't harpoon
we couldn't harpoon
you couldn't harpoon
they couldn't harpoon 	I couldn't be harpooning
you couldn't be harpooning
he couldn't be harpooning
we couldn't be harpooning
you couldn't be harpooning
they couldn't be harpooning	I couldn't have harpooned
you couldn't have harpooned
he couldn't have harpooned
we couldn't have harpooned
you couldn't have harpooned
they couldn't have harpooned	I couldn't have been harpooning
you couldn't have been harpooning
he couldn't have been harpooning
we couldn't have been harpooning
you couldn't have been harpooning
they couldn't have been harpooning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I harpoon?
could you harpoon?
could he harpoon?
could we harpoon?
could you harpoon?
could they harpoon? 	could I be harpooning?
could you be harpooning?
could he be harpooning?
could we be harpooning?
could you be harpooning?
could they be harpooning? 	could I have harpooned?
could you have harpooned?
could he have harpooned?
could we have harpooned?
could you have harpooned?
could they have harpooned? 	could I have been harpooning?
could you have been harpooning?
could he have been harpooning?
could we have been harpooning?
could you have been harpooning?
could they have been harpooning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I harpoon?
couldn't you harpoon?
couldn't he harpoon?
couldn't we harpoon?
couldn't you harpoon?
couldn't they harpoon? 	couldn't I be harpooning?
couldn't you be harpooning?
couldn't he be harpooning?
couldn't we be harpooning?
couldn't you be harpooning?
couldn't they be harpooning? 	couldn't I have harpooned?
couldn't you have harpooned?
couldn't he have harpooned?
couldn't we have harpooned?
couldn't you have harpooned?
couldn't they have harpooned? 	couldn't I have been harpooning?
couldn't you have been harpooning?
couldn't he have been harpooning?
couldn't we have been harpooning?
couldn't you have been harpooning?
couldn't they have been harpooning?