Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could behave behave you could behave behave he could behave behave we could behave behave you could behave behave they could behave behave
V-ing form
I could be behave behaving you could be behave behaving he could be behave behaving we could be behave behaving you could be behave behaving they could be behave behaving
Perfect
I could have behave behaved you could have behave behaved he could have behave behaved we could have behave behaved you could have behave behaved they could have behave behaved
V-ing perfect
I could have been behave behaving you could have been behave behaving he could have been behave behaving we could have been behave behaving you could have been behave behaving they could have been behave behaving
Negation
Simple form
I could not behave behave you could not behave behave he could not behave behave we could not behave behave you could not behave behave they could not behave behave
V-ing form
I could not be behave behaving you could not be behave behaving he could not be behave behaving we could not be behave behaving you could not be behave behaving they could not be behave behaving
Perfect
I could not have behave behaved you could not have behave behaved he could not have behave behaved we could not have behave behaved you could not have behave behaved they could not have behave behaved
V-ing perfect
I could not have been behave behaving you could not have been behave behaving he could not have been behave behaving we could not have been behave behaving you could not have been behave behaving they could not have been behave behaving
Interrogative form
Simple form
could I behave behave? could you behave behave? could he behave behave? could we behave behave? could you behave behave? could they behave behave?
V-ing form
could I be behave behaving? could you be behave behaving? could he be behave behaving? could we be behave behaving? could you be behave behaving? could they be behave behaving?
Perfect
could I have behave behaved? could you have behave behaved? could he have behave behaved? could we have behave behaved? could you have behave behaved? could they have behave behaved?
V-ing perfect
could I have been behave behaving? could you have been behave behaving? could he have been behave behaving? could we have been behave behaving? could you have been behave behaving? could they have been behave behaving?
Interro-negative form
Simple form
could I not behave behave? could you not behave behave? could he not behave behave? could we not behave behave? could you not behave behave? could they not behave behave?
V-ing form
could I not be behave behaving? could you not be behave behaving? could he not be behave behaving? could we not be behave behaving? could you not be behave behaving? could they not be behave behaving?
Perfect
could I not have behave behaved? could you not have behave behaved? could he not have behave behaved? could we not have behave behaved? could you not have behave behaved? could they not have behave behaved?
V-ing perfect
could I not have been behave behaving? could you not have been behave behaving? could he not have been behave behaving? could we not have been behave behaving? could you not have been behave behaving? could they not have been behave behaving?