English verb conjugation
COULD SCALE

Regular verb: scale - scaled - scaled

Affirmation

Simple form	V-ing form
I could scale you could scale he could scale we could scale you could scale they could scale	I could be scaling you could be scaling he could be scaling we could be scaling you could be scaling they could be scaling
Perfect	V-ing perfect
I could have scaled you could have scaled he could have scaled we could have scaled you could have scaled they could have scaled	I could have been scaling you could have been scaling he could have been scaling we could have been scaling you could have been scaling they could have been scaling

Negation

Simple form	V-ing form
I couldn't scale you couldn't scale he couldn't scale we couldn't scale you couldn't scale they couldn't scale	I couldn't be scaling you couldn't be scaling he couldn't be scaling we couldn't be scaling you couldn't be scaling they couldn't be scaling
Perfect	V-ing perfect
I couldn't have scaled you couldn't have scaled he couldn't have scaled we couldn't have scaled you couldn't have scaled they couldn't have scaled	I couldn't have been scaling you couldn't have been scaling he couldn't have been scaling we couldn't have been scaling you couldn't have been scaling they couldn't have been scaling

Interrogative form

Simple form	V-ing form
could I scale? could you scale? could he scale? could we scale? could you scale? could they scale?	could I be scaling? could you be scaling? could he be scaling? could we be scaling? could you be scaling? could they be scaling?
Perfect	V-ing perfect
could I have scaled? could you have scaled? could he have scaled? could we have scaled? could you have scaled? could they have scaled?	could I have been scaling? could you have been scaling? could he have been scaling? could we have been scaling? could you have been scaling? could they have been scaling?

Interro-negative form

Simple form	V-ing form
couldn't I scale? couldn't you scale? couldn't he scale? couldn't we scale? couldn't you scale? couldn't they scale?	couldn't I be scaling? couldn't you be scaling? couldn't he be scaling? couldn't we be scaling? couldn't you be scaling? couldn't they be scaling?
Perfect	V-ing perfect
couldn't I have scaled? couldn't you have scaled? couldn't he have scaled? couldn't we have scaled? couldn't you have scaled? couldn't they have scaled?	couldn't I have been scaling? couldn't you have been scaling? couldn't he have been scaling? couldn't we have been scaling? couldn't you have been scaling? couldn't they have been scaling?