I could invite you could invite he could invite we could invite you could invite they could invite
V-ing form
I could be inviting you could be inviting he could be inviting we could be inviting you could be inviting they could be inviting
Perfect
I could have invited you could have invited he could have invited we could have invited you could have invited they could have invited
V-ing perfect
I could have been inviting you could have been inviting he could have been inviting we could have been inviting you could have been inviting they could have been inviting
Negation
Simple form
I couldn't invite you couldn't invite he couldn't invite we couldn't invite you couldn't invite they couldn't invite
V-ing form
I couldn't be inviting you couldn't be inviting he couldn't be inviting we couldn't be inviting you couldn't be inviting they couldn't be inviting
Perfect
I couldn't have invited you couldn't have invited he couldn't have invited we couldn't have invited you couldn't have invited they couldn't have invited
V-ing perfect
I couldn't have been inviting you couldn't have been inviting he couldn't have been inviting we couldn't have been inviting you couldn't have been inviting they couldn't have been inviting
Interrogative form
Simple form
could I invite? could you invite? could he invite? could we invite? could you invite? could they invite?
V-ing form
could I be inviting? could you be inviting? could he be inviting? could we be inviting? could you be inviting? could they be inviting?
Perfect
could I have invited? could you have invited? could he have invited? could we have invited? could you have invited? could they have invited?
V-ing perfect
could I have been inviting? could you have been inviting? could he have been inviting? could we have been inviting? could you have been inviting? could they have been inviting?
Interro-negative form
Simple form
couldn't I invite? couldn't you invite? couldn't he invite? couldn't we invite? couldn't you invite? couldn't they invite?
V-ing form
couldn't I be inviting? couldn't you be inviting? couldn't he be inviting? couldn't we be inviting? couldn't you be inviting? couldn't they be inviting?
Perfect
couldn't I have invited? couldn't you have invited? couldn't he have invited? couldn't we have invited? couldn't you have invited? couldn't they have invited?
V-ing perfect
couldn't I have been inviting? couldn't you have been inviting? couldn't he have been inviting? couldn't we have been inviting? couldn't you have been inviting? couldn't they have been inviting?