English verb conjugation
COULD PREINVITE

Regular verb: preinvite - preinvited - preinvited

Affirmation

Simple form	V-ing form
I could preinvite you could preinvite he could preinvite we could preinvite you could preinvite they could preinvite	I could be preinviting you could be preinviting he 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 he 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 he 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 he 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 he 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 he 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 he 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 he preinvite? could we preinvite? could you preinvite? could they preinvite?	could I be preinviting? could you be preinviting? could he 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 he 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 he 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 he 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 he 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 he 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 he have been preinviting? couldn't we have been preinviting? couldn't you have been preinviting? couldn't they have been preinviting?