English verb conjugation
COULD OFFER

Regular verb: offer - offered - offered

Affirmation

Simple form	V-ing form
I could offer you could offer he could offer we could offer you could offer they could offer	I could be offering you could be offering he could be offering we could be offering you could be offering they could be offering
Perfect	V-ing perfect
I could have offered you could have offered he could have offered we could have offered you could have offered they could have offered	I could have been offering you could have been offering he could have been offering we could have been offering you could have been offering they could have been offering

Negation

Simple form	V-ing form
I couldn't offer you couldn't offer he couldn't offer we couldn't offer you couldn't offer they couldn't offer	I couldn't be offering you couldn't be offering he couldn't be offering we couldn't be offering you couldn't be offering they couldn't be offering
Perfect	V-ing perfect
I couldn't have offered you couldn't have offered he couldn't have offered we couldn't have offered you couldn't have offered they couldn't have offered	I couldn't have been offering you couldn't have been offering he couldn't have been offering we couldn't have been offering you couldn't have been offering they couldn't have been offering

Interrogative form

Simple form	V-ing form
could I offer? could you offer? could he offer? could we offer? could you offer? could they offer?	could I be offering? could you be offering? could he be offering? could we be offering? could you be offering? could they be offering?
Perfect	V-ing perfect
could I have offered? could you have offered? could he have offered? could we have offered? could you have offered? could they have offered?	could I have been offering? could you have been offering? could he have been offering? could we have been offering? could you have been offering? could they have been offering?

Interro-negative form

Simple form	V-ing form
couldn't I offer? couldn't you offer? couldn't he offer? couldn't we offer? couldn't you offer? couldn't they offer?	couldn't I be offering? couldn't you be offering? couldn't he be offering? couldn't we be offering? couldn't you be offering? couldn't they be offering?
Perfect	V-ing perfect
couldn't I have offered? couldn't you have offered? couldn't he have offered? couldn't we have offered? couldn't you have offered? couldn't they have offered?	couldn't I have been offering? couldn't you have been offering? couldn't he have been offering? couldn't we have been offering? couldn't you have been offering? couldn't they have been offering?