can perk
Regular verb: perk - perked- perked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can perk
you can perk
he can perk
we can perk
you can perk
they can perk 	I can be perking
you can be perking
he can be perking
we can be perking
you can be perking
they can be perking	I can have perked
you can have perked
he can have perked
we can have perked
you can have perked
they can have perked	I can have been perking
you can have been perking
he can have been perking
we can have been perking
you can have been perking
they can have been perking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot perk
you cannot perk
he cannot perk
we cannot perk
you cannot perk
they cannot perk 	I cannot be perking
you cannot be perking
he cannot be perking
we cannot be perking
you cannot be perking
they cannot be perking	I cannot have perked
you cannot have perked
he cannot have perked
we cannot have perked
you cannot have perked
they cannot have perked	I cannot have been perking
you cannot have been perking
he cannot have been perking
we cannot have been perking
you cannot have been perking
they cannot have been perking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I perk?
can you perk?
can he perk?
can we perk?
can you perk?
can they perk? 	can I be perking?
can you be perking?
can he be perking?
can we be perking?
can you be perking?
can they be perking? 	can I have perked?
can you have perked?
can he have perked?
can we have perked?
can you have perked?
can they have perked? 	can I have been perking?
can you have been perking?
can he have been perking?
can we have been perking?
can you have been perking?
can they have been perking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not perk?
can you not perk?
can he not perk?
can we not perk?
can you not perk?
can they not perk? 	can I not be perking?
can you not be perking?
can he not be perking?
can we not be perking?
can you not be perking?
can they not be perking? 	can I not have perked?
can you not have perked?
can he not have perked?
can we not have perked?
can you not have perked?
can they not have perked? 	can I not have been perking?
can you not have been perking?
can he not have been perking?
can we not have been perking?
can you not have been perking?
can they not have been perking?