English verb conjugation
CAN HARK

Regular verb: hark - harked - harked

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I cannot hark you cannot hark he cannot hark we cannot hark you cannot hark they cannot hark	I cannot be harking you cannot be harking he cannot be harking we cannot be harking you cannot be harking they cannot be harking
Perfect	V-ing perfect
I cannot have harked you cannot have harked he cannot have harked we cannot have harked you cannot have harked they cannot have harked	I cannot have been harking you cannot have been harking he cannot have been harking we cannot have been harking you cannot have been harking they cannot have been harking

Interrogative form

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