English verb conjugation
COULD BACKORDER

Regular verb: backorder - backordered - backordered

Affirmation

Simple form	V-ing form
I could backorder you could backorder he could backorder we could backorder you could backorder they could backorder	I could be backordering you could be backordering he could be backordering we could be backordering you could be backordering they could be backordering
Perfect	V-ing perfect
I could have backordered you could have backordered he could have backordered we could have backordered you could have backordered they could have backordered	I could have been backordering you could have been backordering he could have been backordering we could have been backordering you could have been backordering they could have been backordering

Negation

Simple form	V-ing form
I couldn't backorder you couldn't backorder he couldn't backorder we couldn't backorder you couldn't backorder they couldn't backorder	I couldn't be backordering you couldn't be backordering he couldn't be backordering we couldn't be backordering you couldn't be backordering they couldn't be backordering
Perfect	V-ing perfect
I couldn't have backordered you couldn't have backordered he couldn't have backordered we couldn't have backordered you couldn't have backordered they couldn't have backordered	I couldn't have been backordering you couldn't have been backordering he couldn't have been backordering we couldn't have been backordering you couldn't have been backordering they couldn't have been backordering

Interrogative form

Simple form	V-ing form
could I backorder? could you backorder? could he backorder? could we backorder? could you backorder? could they backorder?	could I be backordering? could you be backordering? could he be backordering? could we be backordering? could you be backordering? could they be backordering?
Perfect	V-ing perfect
could I have backordered? could you have backordered? could he have backordered? could we have backordered? could you have backordered? could they have backordered?	could I have been backordering? could you have been backordering? could he have been backordering? could we have been backordering? could you have been backordering? could they have been backordering?

Interro-negative form

Simple form	V-ing form
couldn't I backorder? couldn't you backorder? couldn't he backorder? couldn't we backorder? couldn't you backorder? couldn't they backorder?	couldn't I be backordering? couldn't you be backordering? couldn't he be backordering? couldn't we be backordering? couldn't you be backordering? couldn't they be backordering?
Perfect	V-ing perfect
couldn't I have backordered? couldn't you have backordered? couldn't he have backordered? couldn't we have backordered? couldn't you have backordered? couldn't they have backordered?	couldn't I have been backordering? couldn't you have been backordering? couldn't he have been backordering? couldn't we have been backordering? couldn't you have been backordering? couldn't they have been backordering?