English verb conjugation
CAN SHELL

Regular verb: shell - shelled - shelled

Affirmation

Simple form	V-ing form
I can shell you can shell he can shell we can shell you can shell they can shell	I can be shelling you can be shelling he 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 he 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 he 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 he 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 he 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 he 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 he 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 he shell? can we shell? can you shell? can they shell?	can I be shelling? can you be shelling? can he 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 he 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 he 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 he 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 he 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 he 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 he have been shelling? can't we have been shelling? can't you have been shelling? can't they have been shelling?