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 could not thank so you could not thank so he could not thank so we could not thank so you could not thank so they could not thank so
V-ing form
I could not be thank soing you could not be thank soing he could not be thank soing we could not be thank soing you could not be thank soing they could not be thank soing
Perfect
I could not have thank soed you could not have thank soed he could not have thank soed we could not have thank soed you could not have thank soed they could not have thank soed
V-ing perfect
I could not have been thank soing you could not have been thank soing he could not have been thank soing we could not have been thank soing you could not have been thank soing they could not 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
could I not thank so? could you not thank so? could he not thank so? could we not thank so? could you not thank so? could they not thank so?
V-ing form
could I not be thank soing? could you not be thank soing? could he not be thank soing? could we not be thank soing? could you not be thank soing? could they not be thank soing?
Perfect
could I not have thank soed? could you not have thank soed? could he not have thank soed? could we not have thank soed? could you not have thank soed? could they not have thank soed?
V-ing perfect
could I not have been thank soing? could you not have been thank soing? could he not have been thank soing? could we not have been thank soing? could you not have been thank soing? could they not have been thank soing?