English verb conjugation
CAN CHALK

Regular verb: chalk - chalked - chalked

Affirmation

Simple form	V-ing form
I can chalk you can chalk he can chalk we can chalk you can chalk they can chalk	I can be chalking you can be chalking he can be chalking we can be chalking you can be chalking they can be chalking
Perfect	V-ing perfect
I can have chalked you can have chalked he can have chalked we can have chalked you can have chalked they can have chalked	I can have been chalking you can have been chalking he can have been chalking we can have been chalking you can have been chalking they can have been chalking

Negation

Simple form	V-ing form
I can't chalk you can't chalk he can't chalk we can't chalk you can't chalk they can't chalk	I can't be chalking you can't be chalking he can't be chalking we can't be chalking you can't be chalking they can't be chalking
Perfect	V-ing perfect
I can't have chalked you can't have chalked he can't have chalked we can't have chalked you can't have chalked they can't have chalked	I can't have been chalking you can't have been chalking he can't have been chalking we can't have been chalking you can't have been chalking they can't have been chalking

Interrogative form

Simple form	V-ing form
can I chalk? can you chalk? can he chalk? can we chalk? can you chalk? can they chalk?	can I be chalking? can you be chalking? can he be chalking? can we be chalking? can you be chalking? can they be chalking?
Perfect	V-ing perfect
can I have chalked? can you have chalked? can he have chalked? can we have chalked? can you have chalked? can they have chalked?	can I have been chalking? can you have been chalking? can he have been chalking? can we have been chalking? can you have been chalking? can they have been chalking?

Interro-negative form

Simple form	V-ing form
can't I chalk? can't you chalk? can't he chalk? can't we chalk? can't you chalk? can't they chalk?	can't I be chalking? can't you be chalking? can't he be chalking? can't we be chalking? can't you be chalking? can't they be chalking?
Perfect	V-ing perfect
can't I have chalked? can't you have chalked? can't he have chalked? can't we have chalked? can't you have chalked? can't they have chalked?	can't I have been chalking? can't you have been chalking? can't he have been chalking? can't we have been chalking? can't you have been chalking? can't they have been chalking?