English verb conjugation
COULD DESCALE

Regular verb: descale - descaled - descaled

Affirmation

Simple form	V-ing form
I could descale you could descale he could descale we could descale you could descale they could descale	I could be descaling you could be descaling he could be descaling we could be descaling you could be descaling they could be descaling
Perfect	V-ing perfect
I could have descaled you could have descaled he could have descaled we could have descaled you could have descaled they could have descaled	I could have been descaling you could have been descaling he could have been descaling we could have been descaling you could have been descaling they could have been descaling

Negation

Simple form	V-ing form
I couldn't descale you couldn't descale he couldn't descale we couldn't descale you couldn't descale they couldn't descale	I couldn't be descaling you couldn't be descaling he couldn't be descaling we couldn't be descaling you couldn't be descaling they couldn't be descaling
Perfect	V-ing perfect
I couldn't have descaled you couldn't have descaled he couldn't have descaled we couldn't have descaled you couldn't have descaled they couldn't have descaled	I couldn't have been descaling you couldn't have been descaling he couldn't have been descaling we couldn't have been descaling you couldn't have been descaling they couldn't have been descaling

Interrogative form

Simple form	V-ing form
could I descale? could you descale? could he descale? could we descale? could you descale? could they descale?	could I be descaling? could you be descaling? could he be descaling? could we be descaling? could you be descaling? could they be descaling?
Perfect	V-ing perfect
could I have descaled? could you have descaled? could he have descaled? could we have descaled? could you have descaled? could they have descaled?	could I have been descaling? could you have been descaling? could he have been descaling? could we have been descaling? could you have been descaling? could they have been descaling?

Interro-negative form

Simple form	V-ing form
couldn't I descale? couldn't you descale? couldn't he descale? couldn't we descale? couldn't you descale? couldn't they descale?	couldn't I be descaling? couldn't you be descaling? couldn't he be descaling? couldn't we be descaling? couldn't you be descaling? couldn't they be descaling?
Perfect	V-ing perfect
couldn't I have descaled? couldn't you have descaled? couldn't he have descaled? couldn't we have descaled? couldn't you have descaled? couldn't they have descaled?	couldn't I have been descaling? couldn't you have been descaling? couldn't he have been descaling? couldn't we have been descaling? couldn't you have been descaling? couldn't they have been descaling?