could harness
Regular verb: harness - harnessed- harnessed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could harness
you could harness
she could harness
we could harness
you could harness
they could harness 	I could be harnessing
you could be harnessing
she could be harnessing
we could be harnessing
you could be harnessing
they could be harnessing	I could have harnessed
you could have harnessed
she could have harnessed
we could have harnessed
you could have harnessed
they could have harnessed	I could have been harnessing
you could have been harnessing
she could have been harnessing
we could have been harnessing
you could have been harnessing
they could have been harnessing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not harness
you could not harness
she could not harness
we could not harness
you could not harness
they could not harness 	I could not be harnessing
you could not be harnessing
she could not be harnessing
we could not be harnessing
you could not be harnessing
they could not be harnessing	I could not have harnessed
you could not have harnessed
she could not have harnessed
we could not have harnessed
you could not have harnessed
they could not have harnessed	I could not have been harnessing
you could not have been harnessing
she could not have been harnessing
we could not have been harnessing
you could not have been harnessing
they could not have been harnessing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I harness?
could you harness?
could she harness?
could we harness?
could you harness?
could they harness? 	could I be harnessing?
could you be harnessing?
could she be harnessing?
could we be harnessing?
could you be harnessing?
could they be harnessing? 	could I have harnessed?
could you have harnessed?
could she have harnessed?
could we have harnessed?
could you have harnessed?
could they have harnessed? 	could I have been harnessing?
could you have been harnessing?
could she have been harnessing?
could we have been harnessing?
could you have been harnessing?
could they have been harnessing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not harness?
could you not harness?
could she not harness?
could we not harness?
could you not harness?
could they not harness? 	could I not be harnessing?
could you not be harnessing?
could she not be harnessing?
could we not be harnessing?
could you not be harnessing?
could they not be harnessing? 	could I not have harnessed?
could you not have harnessed?
could she not have harnessed?
could we not have harnessed?
could you not have harnessed?
could they not have harnessed? 	could I not have been harnessing?
could you not have been harnessing?
could she not have been harnessing?
could we not have been harnessing?
could you not have been harnessing?
could they not have been harnessing?