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 cannot unharness
you cannot unharness
he cannot unharness
we cannot unharness
you cannot unharness
they cannot unharness 	I cannot be unharnessing
you cannot be unharnessing
he cannot be unharnessing
we cannot be unharnessing
you cannot be unharnessing
they cannot be unharnessing	I cannot have unharnessed
you cannot have unharnessed
he cannot have unharnessed
we cannot have unharnessed
you cannot have unharnessed
they cannot have unharnessed	I cannot have been unharnessing
you cannot have been unharnessing
he cannot have been unharnessing
we cannot have been unharnessing
you cannot have been unharnessing
they cannot 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 I not unharness?
can you not unharness?
can he not unharness?
can we not unharness?
can you not unharness?
can they not unharness? 	can I not be unharnessing?
can you not be unharnessing?
can he not be unharnessing?
can we not be unharnessing?
can you not be unharnessing?
can they not be unharnessing? 	can I not have unharnessed?
can you not have unharnessed?
can he not have unharnessed?
can we not have unharnessed?
can you not have unharnessed?
can they not have unharnessed? 	can I not have been unharnessing?
can you not have been unharnessing?
can he not have been unharnessing?
can we not have been unharnessing?
can you not have been unharnessing?
can they not have been unharnessing?