English verb conjugation
COULD SCALE

Regular verb: scale - scaled - scaled

Affirmation

Simple form	V-ing form
I could scale you could scale she could scale we could scale you could scale they could scale	I could be scaling you could be scaling she 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 she 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 she 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 she 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 she 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 she 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 she 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 she scale? could we scale? could you scale? could they scale?	could I be scaling? could you be scaling? could she 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 she 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 she 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 she 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 she 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 she 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 she have been scaling? couldn't we have been scaling? couldn't you have been scaling? couldn't they have been scaling?