can shell
Regular verb: shell - shelled- shelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can shell
you can shell
she can shell
we can shell
you can shell
they can shell 	I can be shelling
you can be shelling
she can be shelling
we can be shelling
you can be shelling
they can be shelling	I can have shelled
you can have shelled
she can have shelled
we can have shelled
you can have shelled
they can have shelled	I can have been shelling
you can have been shelling
she can have been shelling
we can have been shelling
you can have been shelling
they can have been shelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't shell
you can't shell
she can't shell
we can't shell
you can't shell
they can't shell 	I can't be shelling
you can't be shelling
she can't be shelling
we can't be shelling
you can't be shelling
they can't be shelling	I can't have shelled
you can't have shelled
she can't have shelled
we can't have shelled
you can't have shelled
they can't have shelled	I can't have been shelling
you can't have been shelling
she can't have been shelling
we can't have been shelling
you can't have been shelling
they can't have been shelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I shell?
can you shell?
can she shell?
can we shell?
can you shell?
can they shell? 	can I be shelling?
can you be shelling?
can she be shelling?
can we be shelling?
can you be shelling?
can they be shelling? 	can I have shelled?
can you have shelled?
can she have shelled?
can we have shelled?
can you have shelled?
can they have shelled? 	can I have been shelling?
can you have been shelling?
can she have been shelling?
can we have been shelling?
can you have been shelling?
can they have been shelling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I shell?
can't you shell?
can't she shell?
can't we shell?
can't you shell?
can't they shell? 	can't I be shelling?
can't you be shelling?
can't she be shelling?
can't we be shelling?
can't you be shelling?
can't they be shelling? 	can't I have shelled?
can't you have shelled?
can't she have shelled?
can't we have shelled?
can't you have shelled?
can't they have shelled? 	can't I have been shelling?
can't you have been shelling?
can't she have been shelling?
can't we have been shelling?
can't you have been shelling?
can't they have been shelling?