can unharness
Regular verb: unharness - unharnessed- unharnessed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can unharness
you can unharness
he can unharness
we can unharness
you can unharness
they can unharness 	I can be unharnessing
you can be unharnessing
he can be unharnessing
we can be unharnessing
you can be unharnessing
they can be unharnessing	I can have unharnessed
you can have unharnessed
he can have unharnessed
we can have unharnessed
you can have unharnessed
they can have unharnessed	I can have been unharnessing
you can have been unharnessing
he can have been unharnessing
we can have been unharnessing
you can have been unharnessing
they can have been unharnessing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't unharness
you can't unharness
he can't unharness
we can't unharness
you can't unharness
they can't unharness 	I can't be unharnessing
you can't be unharnessing
he can't be unharnessing
we can't be unharnessing
you can't be unharnessing
they can't be unharnessing	I can't have unharnessed
you can't have unharnessed
he can't have unharnessed
we can't have unharnessed
you can't have unharnessed
they can't have unharnessed	I can't have been unharnessing
you can't have been unharnessing
he can't have been unharnessing
we can't have been unharnessing
you can't have been unharnessing
they can't have been unharnessing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I unharness?
can you unharness?
can he unharness?
can we unharness?
can you unharness?
can they unharness? 	can I be unharnessing?
can you be unharnessing?
can he be unharnessing?
can we be unharnessing?
can you be unharnessing?
can they be unharnessing? 	can I have unharnessed?
can you have unharnessed?
can he have unharnessed?
can we have unharnessed?
can you have unharnessed?
can they have unharnessed? 	can I have been unharnessing?
can you have been unharnessing?
can he have been unharnessing?
can we have been unharnessing?
can you have been unharnessing?
can they have been unharnessing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I unharness?
can't you unharness?
can't he unharness?
can't we unharness?
can't you unharness?
can't they unharness? 	can't I be unharnessing?
can't you be unharnessing?
can't he be unharnessing?
can't we be unharnessing?
can't you be unharnessing?
can't they be unharnessing? 	can't I have unharnessed?
can't you have unharnessed?
can't he have unharnessed?
can't we have unharnessed?
can't you have unharnessed?
can't they have unharnessed? 	can't I have been unharnessing?
can't you have been unharnessing?
can't he have been unharnessing?
can't we have been unharnessing?
can't you have been unharnessing?
can't they have been unharnessing?