English verb conjugation
COULD HARK

Regular verb: hark - harked - harked

Affirmation

Simple form	V-ing form
I could hark you could hark she could hark we could hark you could hark they could hark	I could be harking you could be harking she could be harking we could be harking you could be harking they could be harking
Perfect	V-ing perfect
I could have harked you could have harked she 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 she 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
I could not hark you could not hark she could not hark we could not hark you could not hark they could not hark	I could not be harking you could not be harking she could not be harking we could not be harking you could not be harking they could not be harking
Perfect	V-ing perfect
I could not have harked you could not have harked she could not have harked we could not have harked you could not have harked they could not have harked	I could not have been harking you could not have been harking she could not have been harking we could not have been harking you could not have been harking they could not have been harking

Interrogative form

Simple form	V-ing form
could I hark? could you hark? could she hark? could we hark? could you hark? could they hark?	could I be harking? could you be harking? could she be harking? could we be harking? could you be harking? could they be harking?
Perfect	V-ing perfect
could I have harked? could you have harked? could she 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 she 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
could I not hark? could you not hark? could she not hark? could we not hark? could you not hark? could they not hark?	could I not be harking? could you not be harking? could she not be harking? could we not be harking? could you not be harking? could they not be harking?
Perfect	V-ing perfect
could I not have harked? could you not have harked? could she not have harked? could we not have harked? could you not have harked? could they not have harked?	could I not have been harking? could you not have been harking? could she not have been harking? could we not have been harking? could you not have been harking? could they not have been harking?