English verb conjugation
CAN PERK

Regular verb: perk - perked - perked

Affirmation

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