English verb conjugation
COULD SUBTOTAL

Regular verb: subtotal - subtotaled - subtotaled

Affirmation

Simple form	V-ing form
I could subtotal you could subtotal she could subtotal we could subtotal you could subtotal they could subtotal	I could be subtotaling you could be subtotaling she could be subtotaling we could be subtotaling you could be subtotaling they could be subtotaling
Perfect	V-ing perfect
I could have subtotaled you could have subtotaled she could have subtotaled we could have subtotaled you could have subtotaled they could have subtotaled	I could have been subtotaling you could have been subtotaling she could have been subtotaling we could have been subtotaling you could have been subtotaling they could have been subtotaling

Negation

Simple form	V-ing form
I couldn't subtotal you couldn't subtotal she couldn't subtotal we couldn't subtotal you couldn't subtotal they couldn't subtotal	I couldn't be subtotaling you couldn't be subtotaling she couldn't be subtotaling we couldn't be subtotaling you couldn't be subtotaling they couldn't be subtotaling
Perfect	V-ing perfect
I couldn't have subtotaled you couldn't have subtotaled she couldn't have subtotaled we couldn't have subtotaled you couldn't have subtotaled they couldn't have subtotaled	I couldn't have been subtotaling you couldn't have been subtotaling she couldn't have been subtotaling we couldn't have been subtotaling you couldn't have been subtotaling they couldn't have been subtotaling

Interrogative form

Simple form	V-ing form
could I subtotal? could you subtotal? could she subtotal? could we subtotal? could you subtotal? could they subtotal?	could I be subtotaling? could you be subtotaling? could she be subtotaling? could we be subtotaling? could you be subtotaling? could they be subtotaling?
Perfect	V-ing perfect
could I have subtotaled? could you have subtotaled? could she have subtotaled? could we have subtotaled? could you have subtotaled? could they have subtotaled?	could I have been subtotaling? could you have been subtotaling? could she have been subtotaling? could we have been subtotaling? could you have been subtotaling? could they have been subtotaling?

Interro-negative form

Simple form	V-ing form
couldn't I subtotal? couldn't you subtotal? couldn't she subtotal? couldn't we subtotal? couldn't you subtotal? couldn't they subtotal?	couldn't I be subtotaling? couldn't you be subtotaling? couldn't she be subtotaling? couldn't we be subtotaling? couldn't you be subtotaling? couldn't they be subtotaling?
Perfect	V-ing perfect
couldn't I have subtotaled? couldn't you have subtotaled? couldn't she have subtotaled? couldn't we have subtotaled? couldn't you have subtotaled? couldn't they have subtotaled?	couldn't I have been subtotaling? couldn't you have been subtotaling? couldn't she have been subtotaling? couldn't we have been subtotaling? couldn't you have been subtotaling? couldn't they have been subtotaling?