English verb conjugation
COULD UNSHELL

Regular verb: unshell - unshelled - unshelled

Affirmation

Simple form	V-ing form
I could unshell you could unshell he could unshell we could unshell you could unshell they could unshell	I could be unshelling you could be unshelling he could be unshelling we could be unshelling you could be unshelling they could be unshelling
Perfect	V-ing perfect
I could have unshelled you could have unshelled he could have unshelled we could have unshelled you could have unshelled they could have unshelled	I could have been unshelling you could have been unshelling he could have been unshelling we could have been unshelling you could have been unshelling they could have been unshelling

Negation

Simple form	V-ing form
I couldn't unshell you couldn't unshell he couldn't unshell we couldn't unshell you couldn't unshell they couldn't unshell	I couldn't be unshelling you couldn't be unshelling he couldn't be unshelling we couldn't be unshelling you couldn't be unshelling they couldn't be unshelling
Perfect	V-ing perfect
I couldn't have unshelled you couldn't have unshelled he couldn't have unshelled we couldn't have unshelled you couldn't have unshelled they couldn't have unshelled	I couldn't have been unshelling you couldn't have been unshelling he couldn't have been unshelling we couldn't have been unshelling you couldn't have been unshelling they couldn't have been unshelling

Interrogative form

Simple form	V-ing form
could I unshell? could you unshell? could he unshell? could we unshell? could you unshell? could they unshell?	could I be unshelling? could you be unshelling? could he be unshelling? could we be unshelling? could you be unshelling? could they be unshelling?
Perfect	V-ing perfect
could I have unshelled? could you have unshelled? could he have unshelled? could we have unshelled? could you have unshelled? could they have unshelled?	could I have been unshelling? could you have been unshelling? could he have been unshelling? could we have been unshelling? could you have been unshelling? could they have been unshelling?

Interro-negative form

Simple form	V-ing form
couldn't I unshell? couldn't you unshell? couldn't he unshell? couldn't we unshell? couldn't you unshell? couldn't they unshell?	couldn't I be unshelling? couldn't you be unshelling? couldn't he be unshelling? couldn't we be unshelling? couldn't you be unshelling? couldn't they be unshelling?
Perfect	V-ing perfect
couldn't I have unshelled? couldn't you have unshelled? couldn't he have unshelled? couldn't we have unshelled? couldn't you have unshelled? couldn't they have unshelled?	couldn't I have been unshelling? couldn't you have been unshelling? couldn't he have been unshelling? couldn't we have been unshelling? couldn't you have been unshelling? couldn't they have been unshelling?