I can harness you can harness he can harness we can harness you can harness they can harness
V-ing form
I can be harnessing you can be harnessing he can be harnessing we can be harnessing you can be harnessing they can be harnessing
Perfect
I can have harnessed you can have harnessed he can have harnessed we can have harnessed you can have harnessed they can have harnessed
V-ing perfect
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
I cannot harness you cannot harness he cannot harness we cannot harness you cannot harness they cannot harness
V-ing form
I cannot be harnessing you cannot be harnessing he cannot be harnessing we cannot be harnessing you cannot be harnessing they cannot be harnessing
Perfect
I cannot have harnessed you cannot have harnessed he cannot have harnessed we cannot have harnessed you cannot have harnessed they cannot have harnessed
V-ing perfect
I cannot have been harnessing you cannot have been harnessing he cannot have been harnessing we cannot have been harnessing you cannot have been harnessing they cannot have been harnessing
Interrogative form
Simple form
can I harness? can you harness? can he harness? can we harness? can you harness? can they harness?
V-ing form
can I be harnessing? can you be harnessing? can he be harnessing? can we be harnessing? can you be harnessing? can they be harnessing?
Perfect
can I have harnessed? can you have harnessed? can he have harnessed? can we have harnessed? can you have harnessed? can they have harnessed?
V-ing perfect
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
can I not harness? can you not harness? can he not harness? can we not harness? can you not harness? can they not harness?
V-ing form
can I not be harnessing? can you not be harnessing? can he not be harnessing? can we not be harnessing? can you not be harnessing? can they not be harnessing?
Perfect
can I not have harnessed? can you not have harnessed? can he not have harnessed? can we not have harnessed? can you not have harnessed? can they not have harnessed?
V-ing perfect
can I not have been harnessing? can you not have been harnessing? can he not have been harnessing? can we not have been harnessing? can you not have been harnessing? can they not have been harnessing?