Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could wave wave you could wave wave he could wave wave we could wave wave you could wave wave they could wave wave
V-ing form
I could be wave waving you could be wave waving he could be wave waving we could be wave waving you could be wave waving they could be wave waving
Perfect
I could have wave waved you could have wave waved he could have wave waved we could have wave waved you could have wave waved they could have wave waved
V-ing perfect
I could have been wave waving you could have been wave waving he could have been wave waving we could have been wave waving you could have been wave waving they could have been wave waving
Negation
Simple form
I couldn't wave wave you couldn't wave wave he couldn't wave wave we couldn't wave wave you couldn't wave wave they couldn't wave wave
V-ing form
I couldn't be wave waving you couldn't be wave waving he couldn't be wave waving we couldn't be wave waving you couldn't be wave waving they couldn't be wave waving
Perfect
I couldn't have wave waved you couldn't have wave waved he couldn't have wave waved we couldn't have wave waved you couldn't have wave waved they couldn't have wave waved
V-ing perfect
I couldn't have been wave waving you couldn't have been wave waving he couldn't have been wave waving we couldn't have been wave waving you couldn't have been wave waving they couldn't have been wave waving
Interrogative form
Simple form
could I wave wave? could you wave wave? could he wave wave? could we wave wave? could you wave wave? could they wave wave?
V-ing form
could I be wave waving? could you be wave waving? could he be wave waving? could we be wave waving? could you be wave waving? could they be wave waving?
Perfect
could I have wave waved? could you have wave waved? could he have wave waved? could we have wave waved? could you have wave waved? could they have wave waved?
V-ing perfect
could I have been wave waving? could you have been wave waving? could he have been wave waving? could we have been wave waving? could you have been wave waving? could they have been wave waving?
Interro-negative form
Simple form
couldn't I wave wave? couldn't you wave wave? couldn't he wave wave? couldn't we wave wave? couldn't you wave wave? couldn't they wave wave?
V-ing form
couldn't I be wave waving? couldn't you be wave waving? couldn't he be wave waving? couldn't we be wave waving? couldn't you be wave waving? couldn't they be wave waving?
Perfect
couldn't I have wave waved? couldn't you have wave waved? couldn't he have wave waved? couldn't we have wave waved? couldn't you have wave waved? couldn't they have wave waved?
V-ing perfect
couldn't I have been wave waving? couldn't you have been wave waving? couldn't he have been wave waving? couldn't we have been wave waving? couldn't you have been wave waving? couldn't they have been wave waving?