can shorten
Regular verb: shorten - shortened- shortened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can shorten
you can shorten
he can shorten
we can shorten
you can shorten
they can shorten 	I can be shortening
you can be shortening
he can be shortening
we can be shortening
you can be shortening
they can be shortening	I can have shortened
you can have shortened
he 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
he 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 cannot shorten
you cannot shorten
he cannot shorten
we cannot shorten
you cannot shorten
they cannot shorten 	I cannot be shortening
you cannot be shortening
he cannot be shortening
we cannot be shortening
you cannot be shortening
they cannot be shortening	I cannot have shortened
you cannot have shortened
he cannot have shortened
we cannot have shortened
you cannot have shortened
they cannot have shortened	I cannot have been shortening
you cannot have been shortening
he cannot have been shortening
we cannot have been shortening
you cannot have been shortening
they cannot have been shortening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I shorten?
can you shorten?
can he shorten?
can we shorten?
can you shorten?
can they shorten? 	can I be shortening?
can you be shortening?
can he be shortening?
can we be shortening?
can you be shortening?
can they be shortening? 	can I have shortened?
can you have shortened?
can he 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 he 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 I not shorten?
can you not shorten?
can he not shorten?
can we not shorten?
can you not shorten?
can they not shorten? 	can I not be shortening?
can you not be shortening?
can he not be shortening?
can we not be shortening?
can you not be shortening?
can they not be shortening? 	can I not have shortened?
can you not have shortened?
can he not have shortened?
can we not have shortened?
can you not have shortened?
can they not have shortened? 	can I not have been shortening?
can you not have been shortening?
can he not have been shortening?
can we not have been shortening?
can you not have been shortening?
can they not have been shortening?