can chalk
Regular verb: chalk - chalked- chalked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?