English verb conjugation
CAN SHELL

Regular verb: shell - shelled - shelled

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?