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