can unpin
Regular verb: unpin - unpinned- unpinned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can unpin
you can unpin
he can unpin
we can unpin
you can unpin
they can unpin 	I can be unpinning
you can be unpinning
he can be unpinning
we can be unpinning
you can be unpinning
they can be unpinning	I can have unpinned
you can have unpinned
he can have unpinned
we can have unpinned
you can have unpinned
they can have unpinned	I can have been unpinning
you can have been unpinning
he can have been unpinning
we can have been unpinning
you can have been unpinning
they can have been unpinning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't unpin
you can't unpin
he can't unpin
we can't unpin
you can't unpin
they can't unpin 	I can't be unpinning
you can't be unpinning
he can't be unpinning
we can't be unpinning
you can't be unpinning
they can't be unpinning	I can't have unpinned
you can't have unpinned
he can't have unpinned
we can't have unpinned
you can't have unpinned
they can't have unpinned	I can't have been unpinning
you can't have been unpinning
he can't have been unpinning
we can't have been unpinning
you can't have been unpinning
they can't have been unpinning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I unpin?
can you unpin?
can he unpin?
can we unpin?
can you unpin?
can they unpin? 	can I be unpinning?
can you be unpinning?
can he be unpinning?
can we be unpinning?
can you be unpinning?
can they be unpinning? 	can I have unpinned?
can you have unpinned?
can he have unpinned?
can we have unpinned?
can you have unpinned?
can they have unpinned? 	can I have been unpinning?
can you have been unpinning?
can he have been unpinning?
can we have been unpinning?
can you have been unpinning?
can they have been unpinning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I unpin?
can't you unpin?
can't he unpin?
can't we unpin?
can't you unpin?
can't they unpin? 	can't I be unpinning?
can't you be unpinning?
can't he be unpinning?
can't we be unpinning?
can't you be unpinning?
can't they be unpinning? 	can't I have unpinned?
can't you have unpinned?
can't he have unpinned?
can't we have unpinned?
can't you have unpinned?
can't they have unpinned? 	can't I have been unpinning?
can't you have been unpinning?
can't he have been unpinning?
can't we have been unpinning?
can't you have been unpinning?
can't they have been unpinning?