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 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
Perfect	V-ing perfect
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
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'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?
Perfect	V-ing perfect
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?