can shorten
Regular verb: shorten - shortened- shortened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can shorten
you can shorten
she can shorten
we can shorten
you can shorten
they can shorten 	I can be shortening
you can be shortening
she can be shortening
we can be shortening
you can be shortening
they can be shortening	I can have shortened
you can have shortened
she can have shortened
we can have shortened
you can have shortened
they can have shortened	I can have been shortening
you can have been shortening
she can have been shortening
we can have been shortening
you can have been shortening
they can have been shortening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't shorten
you can't shorten
she can't shorten
we can't shorten
you can't shorten
they can't shorten 	I can't be shortening
you can't be shortening
she can't be shortening
we can't be shortening
you can't be shortening
they can't be shortening	I can't have shortened
you can't have shortened
she can't have shortened
we can't have shortened
you can't have shortened
they can't have shortened	I can't have been shortening
you can't have been shortening
she can't have been shortening
we can't have been shortening
you can't have been shortening
they can't have been shortening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I shorten?
can you shorten?
can she shorten?
can we shorten?
can you shorten?
can they shorten? 	can I be shortening?
can you be shortening?
can she be shortening?
can we be shortening?
can you be shortening?
can they be shortening? 	can I have shortened?
can you have shortened?
can she have shortened?
can we have shortened?
can you have shortened?
can they have shortened? 	can I have been shortening?
can you have been shortening?
can she have been shortening?
can we have been shortening?
can you have been shortening?
can they have been shortening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I shorten?
can't you shorten?
can't she shorten?
can't we shorten?
can't you shorten?
can't they shorten? 	can't I be shortening?
can't you be shortening?
can't she be shortening?
can't we be shortening?
can't you be shortening?
can't they be shortening? 	can't I have shortened?
can't you have shortened?
can't she have shortened?
can't we have shortened?
can't you have shortened?
can't they have shortened? 	can't I have been shortening?
can't you have been shortening?
can't she have been shortening?
can't we have been shortening?
can't you have been shortening?
can't they have been shortening?