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