English verb conjugation
COULD OFFER

Regular verb: offer - offered - offered

Affirmation

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