can preen
Regular verb: preen - preened- preened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I cannot preen
you cannot preen
he cannot preen
we cannot preen
you cannot preen
they cannot preen 	I cannot be preening
you cannot be preening
he cannot be preening
we cannot be preening
you cannot be preening
they cannot be preening	I cannot have preened
you cannot have preened
he cannot have preened
we cannot have preened
you cannot have preened
they cannot have preened	I cannot have been preening
you cannot have been preening
he cannot have been preening
we cannot have been preening
you cannot have been preening
they cannot have been preening	

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