can sadden
Regular verb: sadden - saddened- saddened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can sadden
you can sadden
she can sadden
we can sadden
you can sadden
they can sadden 	I can be saddening
you can be saddening
she can be saddening
we can be saddening
you can be saddening
they can be saddening	I can have saddened
you can have saddened
she can have saddened
we can have saddened
you can have saddened
they can have saddened	I can have been saddening
you can have been saddening
she can have been saddening
we can have been saddening
you can have been saddening
they can have been saddening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't sadden
you can't sadden
she can't sadden
we can't sadden
you can't sadden
they can't sadden 	I can't be saddening
you can't be saddening
she can't be saddening
we can't be saddening
you can't be saddening
they can't be saddening	I can't have saddened
you can't have saddened
she can't have saddened
we can't have saddened
you can't have saddened
they can't have saddened	I can't have been saddening
you can't have been saddening
she can't have been saddening
we can't have been saddening
you can't have been saddening
they can't have been saddening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I sadden?
can you sadden?
can she sadden?
can we sadden?
can you sadden?
can they sadden? 	can I be saddening?
can you be saddening?
can she be saddening?
can we be saddening?
can you be saddening?
can they be saddening? 	can I have saddened?
can you have saddened?
can she have saddened?
can we have saddened?
can you have saddened?
can they have saddened? 	can I have been saddening?
can you have been saddening?
can she have been saddening?
can we have been saddening?
can you have been saddening?
can they have been saddening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I sadden?
can't you sadden?
can't she sadden?
can't we sadden?
can't you sadden?
can't they sadden? 	can't I be saddening?
can't you be saddening?
can't she be saddening?
can't we be saddening?
can't you be saddening?
can't they be saddening? 	can't I have saddened?
can't you have saddened?
can't she have saddened?
can't we have saddened?
can't you have saddened?
can't they have saddened? 	can't I have been saddening?
can't you have been saddening?
can't she have been saddening?
can't we have been saddening?
can't you have been saddening?
can't they have been saddening?