can calk
Regular verb: calk - calked- calked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can calk
you can calk
she can calk
we can calk
you can calk
they can calk 	I can be calking
you can be calking
she can be calking
we can be calking
you can be calking
they can be calking	I can have calked
you can have calked
she can have calked
we can have calked
you can have calked
they can have calked	I can have been calking
you can have been calking
she can have been calking
we can have been calking
you can have been calking
they can have been calking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot calk
you cannot calk
she cannot calk
we cannot calk
you cannot calk
they cannot calk 	I cannot be calking
you cannot be calking
she cannot be calking
we cannot be calking
you cannot be calking
they cannot be calking	I cannot have calked
you cannot have calked
she cannot have calked
we cannot have calked
you cannot have calked
they cannot have calked	I cannot have been calking
you cannot have been calking
she cannot have been calking
we cannot have been calking
you cannot have been calking
they cannot have been calking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I calk?
can you calk?
can she calk?
can we calk?
can you calk?
can they calk? 	can I be calking?
can you be calking?
can she be calking?
can we be calking?
can you be calking?
can they be calking? 	can I have calked?
can you have calked?
can she have calked?
can we have calked?
can you have calked?
can they have calked? 	can I have been calking?
can you have been calking?
can she have been calking?
can we have been calking?
can you have been calking?
can they have been calking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not calk?
can you not calk?
can she not calk?
can we not calk?
can you not calk?
can they not calk? 	can I not be calking?
can you not be calking?
can she not be calking?
can we not be calking?
can you not be calking?
can they not be calking? 	can I not have calked?
can you not have calked?
can she not have calked?
can we not have calked?
can you not have calked?
can they not have calked? 	can I not have been calking?
can you not have been calking?
can she not have been calking?
can we not have been calking?
can you not have been calking?
can they not have been calking?