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 couldn't reach reach you couldn't reach reach he couldn't reach reach we couldn't reach reach you couldn't reach reach they couldn't reach reach
V-ing form
I couldn't be reach reaching you couldn't be reach reaching he couldn't be reach reaching we couldn't be reach reaching you couldn't be reach reaching they couldn't be reach reaching
Perfect
I couldn't have reach reached you couldn't have reach reached he couldn't have reach reached we couldn't have reach reached you couldn't have reach reached they couldn't have reach reached
V-ing perfect
I couldn't have been reach reaching you couldn't have been reach reaching he couldn't have been reach reaching we couldn't have been reach reaching you couldn't have been reach reaching they couldn't 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
couldn't I reach reach? couldn't you reach reach? couldn't he reach reach? couldn't we reach reach? couldn't you reach reach? couldn't they reach reach?
V-ing form
couldn't I be reach reaching? couldn't you be reach reaching? couldn't he be reach reaching? couldn't we be reach reaching? couldn't you be reach reaching? couldn't they be reach reaching?
Perfect
couldn't I have reach reached? couldn't you have reach reached? couldn't he have reach reached? couldn't we have reach reached? couldn't you have reach reached? couldn't they have reach reached?
V-ing perfect
couldn't I have been reach reaching? couldn't you have been reach reaching? couldn't he have been reach reaching? couldn't we have been reach reaching? couldn't you have been reach reaching? couldn't they have been reach reaching?