can box
Regular verb: box - boxed- boxed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can box
you can box
she can box
we can box
you can box
they can box 	I can be boxing
you can be boxing
she can be boxing
we can be boxing
you can be boxing
they can be boxing	I can have boxed
you can have boxed
she can have boxed
we can have boxed
you can have boxed
they can have boxed	I can have been boxing
you can have been boxing
she can have been boxing
we can have been boxing
you can have been boxing
they can have been boxing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't box
you can't box
she can't box
we can't box
you can't box
they can't box 	I can't be boxing
you can't be boxing
she can't be boxing
we can't be boxing
you can't be boxing
they can't be boxing	I can't have boxed
you can't have boxed
she can't have boxed
we can't have boxed
you can't have boxed
they can't have boxed	I can't have been boxing
you can't have been boxing
she can't have been boxing
we can't have been boxing
you can't have been boxing
they can't have been boxing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I box?
can you box?
can she box?
can we box?
can you box?
can they box? 	can I be boxing?
can you be boxing?
can she be boxing?
can we be boxing?
can you be boxing?
can they be boxing? 	can I have boxed?
can you have boxed?
can she have boxed?
can we have boxed?
can you have boxed?
can they have boxed? 	can I have been boxing?
can you have been boxing?
can she have been boxing?
can we have been boxing?
can you have been boxing?
can they have been boxing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I box?
can't you box?
can't she box?
can't we box?
can't you box?
can't they box? 	can't I be boxing?
can't you be boxing?
can't she be boxing?
can't we be boxing?
can't you be boxing?
can't they be boxing? 	can't I have boxed?
can't you have boxed?
can't she have boxed?
can't we have boxed?
can't you have boxed?
can't they have boxed? 	can't I have been boxing?
can't you have been boxing?
can't she have been boxing?
can't we have been boxing?
can't you have been boxing?
can't they have been boxing?