can calk
Regular verb: calk - calked- calked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can calk
you can calk
he can calk
we can calk
you can calk
they can calk 	I can be calking
you can be calking
he can be calking
we can be calking
you can be calking
they can be calking	I can have calked
you can have calked
he 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
he 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
he cannot calk
we cannot calk
you cannot calk
they cannot calk 	I cannot be calking
you cannot be calking
he cannot be calking
we cannot be calking
you cannot be calking
they cannot be calking	I cannot have calked
you cannot have calked
he 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
he 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 he calk?
can we calk?
can you calk?
can they calk? 	can I be calking?
can you be calking?
can he be calking?
can we be calking?
can you be calking?
can they be calking? 	can I have calked?
can you have calked?
can he 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 he 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 he 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 he 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 he 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 he not have been calking?
can we not have been calking?
can you not have been calking?
can they not have been calking?