can harness
Regular verb: harness - harnessed- harnessed

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't harness
you can't harness
he can't harness
we can't harness
you can't harness
they can't harness 	I can't be harnessing
you can't be harnessing
he can't be harnessing
we can't be harnessing
you can't be harnessing
they can't be harnessing	I can't have harnessed
you can't have harnessed
he can't have harnessed
we can't have harnessed
you can't have harnessed
they can't have harnessed	I can't have been harnessing
you can't have been harnessing
he can't have been harnessing
we can't have been harnessing
you can't have been harnessing
they can't have been harnessing	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I harness?
can't you harness?
can't he harness?
can't we harness?
can't you harness?
can't they harness? 	can't I be harnessing?
can't you be harnessing?
can't he be harnessing?
can't we be harnessing?
can't you be harnessing?
can't they be harnessing? 	can't I have harnessed?
can't you have harnessed?
can't he have harnessed?
can't we have harnessed?
can't you have harnessed?
can't they have harnessed? 	can't I have been harnessing?
can't you have been harnessing?
can't he have been harnessing?
can't we have been harnessing?
can't you have been harnessing?
can't they have been harnessing?