English verb conjugation
COULD PREINVITE

Regular verb: preinvite - preinvited - preinvited

Affirmation

Simple form	V-ing form
I could preinvite you could preinvite she could preinvite we could preinvite you could preinvite they could preinvite	I could be preinviting you could be preinviting she could be preinviting we could be preinviting you could be preinviting they could be preinviting
Perfect	V-ing perfect
I could have preinvited you could have preinvited she could have preinvited we could have preinvited you could have preinvited they could have preinvited	I could have been preinviting you could have been preinviting she could have been preinviting we could have been preinviting you could have been preinviting they could have been preinviting

Negation

Simple form	V-ing form
I couldn't preinvite you couldn't preinvite she couldn't preinvite we couldn't preinvite you couldn't preinvite they couldn't preinvite	I couldn't be preinviting you couldn't be preinviting she couldn't be preinviting we couldn't be preinviting you couldn't be preinviting they couldn't be preinviting
Perfect	V-ing perfect
I couldn't have preinvited you couldn't have preinvited she couldn't have preinvited we couldn't have preinvited you couldn't have preinvited they couldn't have preinvited	I couldn't have been preinviting you couldn't have been preinviting she couldn't have been preinviting we couldn't have been preinviting you couldn't have been preinviting they couldn't have been preinviting

Interrogative form

Simple form	V-ing form
could I preinvite? could you preinvite? could she preinvite? could we preinvite? could you preinvite? could they preinvite?	could I be preinviting? could you be preinviting? could she be preinviting? could we be preinviting? could you be preinviting? could they be preinviting?
Perfect	V-ing perfect
could I have preinvited? could you have preinvited? could she have preinvited? could we have preinvited? could you have preinvited? could they have preinvited?	could I have been preinviting? could you have been preinviting? could she have been preinviting? could we have been preinviting? could you have been preinviting? could they have been preinviting?

Interro-negative form

Simple form	V-ing form
couldn't I preinvite? couldn't you preinvite? couldn't she preinvite? couldn't we preinvite? couldn't you preinvite? couldn't they preinvite?	couldn't I be preinviting? couldn't you be preinviting? couldn't she be preinviting? couldn't we be preinviting? couldn't you be preinviting? couldn't they be preinviting?
Perfect	V-ing perfect
couldn't I have preinvited? couldn't you have preinvited? couldn't she have preinvited? couldn't we have preinvited? couldn't you have preinvited? couldn't they have preinvited?	couldn't I have been preinviting? couldn't you have been preinviting? couldn't she have been preinviting? couldn't we have been preinviting? couldn't you have been preinviting? couldn't they have been preinviting?