English verb conjugation
CAN OFFER

Regular verb: offer - offered - offered

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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