English verb conjugation
COULD UNPIN

Regular verb: unpin - unpinned - unpinned

Affirmation

Simple form	V-ing form
I could unpin you could unpin she could unpin we could unpin you could unpin they could unpin	I could be unpinning you could be unpinning she could be unpinning we could be unpinning you could be unpinning they could be unpinning
Perfect	V-ing perfect
I could have unpinned you could have unpinned she could have unpinned we could have unpinned you could have unpinned they could have unpinned	I could have been unpinning you could have been unpinning she could have been unpinning we could have been unpinning you could have been unpinning they could have been unpinning

Negation

Simple form	V-ing form
I could not unpin you could not unpin she could not unpin we could not unpin you could not unpin they could not unpin	I could not be unpinning you could not be unpinning she could not be unpinning we could not be unpinning you could not be unpinning they could not be unpinning
Perfect	V-ing perfect
I could not have unpinned you could not have unpinned she could not have unpinned we could not have unpinned you could not have unpinned they could not have unpinned	I could not have been unpinning you could not have been unpinning she could not have been unpinning we could not have been unpinning you could not have been unpinning they could not have been unpinning

Interrogative form

Simple form	V-ing form
could I unpin? could you unpin? could she unpin? could we unpin? could you unpin? could they unpin?	could I be unpinning? could you be unpinning? could she be unpinning? could we be unpinning? could you be unpinning? could they be unpinning?
Perfect	V-ing perfect
could I have unpinned? could you have unpinned? could she have unpinned? could we have unpinned? could you have unpinned? could they have unpinned?	could I have been unpinning? could you have been unpinning? could she have been unpinning? could we have been unpinning? could you have been unpinning? could they have been unpinning?

Interro-negative form

Simple form	V-ing form
could I not unpin? could you not unpin? could she not unpin? could we not unpin? could you not unpin? could they not unpin?	could I not be unpinning? could you not be unpinning? could she not be unpinning? could we not be unpinning? could you not be unpinning? could they not be unpinning?
Perfect	V-ing perfect
could I not have unpinned? could you not have unpinned? could she not have unpinned? could we not have unpinned? could you not have unpinned? could they not have unpinned?	could I not have been unpinning? could you not have been unpinning? could she not have been unpinning? could we not have been unpinning? could you not have been unpinning? could they not have been unpinning?