English verb conjugation
COULD HARNESS

Regular verb: harness - harnessed - harnessed

Affirmation

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

Interrogative form

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