English verb conjugation
CAN PREEN

Regular verb: preen - preened - preened

Affirmation

Simple form	V-ing form
I can preen you can preen he can preen we can preen you can preen they can preen	I can be preening you can be preening he can be preening we can be preening you can be preening they can be preening
Perfect	V-ing perfect
I can have preened you can have preened he can have preened we can have preened you can have preened they can have preened	I can have been preening you can have been preening he can have been preening we can have been preening you can have been preening they can have been preening

Negation

Simple form	V-ing form
I can't preen you can't preen he can't preen we can't preen you can't preen they can't preen	I can't be preening you can't be preening he can't be preening we can't be preening you can't be preening they can't be preening
Perfect	V-ing perfect
I can't have preened you can't have preened he can't have preened we can't have preened you can't have preened they can't have preened	I can't have been preening you can't have been preening he can't have been preening we can't have been preening you can't have been preening they can't have been preening

Interrogative form

Simple form	V-ing form
can I preen? can you preen? can he preen? can we preen? can you preen? can they preen?	can I be preening? can you be preening? can he be preening? can we be preening? can you be preening? can they be preening?
Perfect	V-ing perfect
can I have preened? can you have preened? can he have preened? can we have preened? can you have preened? can they have preened?	can I have been preening? can you have been preening? can he have been preening? can we have been preening? can you have been preening? can they have been preening?

Interro-negative form

Simple form	V-ing form
can't I preen? can't you preen? can't he preen? can't we preen? can't you preen? can't they preen?	can't I be preening? can't you be preening? can't he be preening? can't we be preening? can't you be preening? can't they be preening?
Perfect	V-ing perfect
can't I have preened? can't you have preened? can't he have preened? can't we have preened? can't you have preened? can't they have preened?	can't I have been preening? can't you have been preening? can't he have been preening? can't we have been preening? can't you have been preening? can't they have been preening?