I can reach you can reach he can reach we can reach you can reach they can reach
V-ing form
I can be reaching you can be reaching he can be reaching we can be reaching you can be reaching they can be reaching
Perfect
I can have reached you can have reached he can have reached we can have reached you can have reached they can have reached
V-ing perfect
I can have been reaching you can have been reaching he can have been reaching we can have been reaching you can have been reaching they can have been reaching
Negation
Simple form
I cannot reach you cannot reach he cannot reach we cannot reach you cannot reach they cannot reach
V-ing form
I cannot be reaching you cannot be reaching he cannot be reaching we cannot be reaching you cannot be reaching they cannot be reaching
Perfect
I cannot have reached you cannot have reached he cannot have reached we cannot have reached you cannot have reached they cannot have reached
V-ing perfect
I cannot have been reaching you cannot have been reaching he cannot have been reaching we cannot have been reaching you cannot have been reaching they cannot have been reaching
Interrogative form
Simple form
can I reach? can you reach? can he reach? can we reach? can you reach? can they reach?
V-ing form
can I be reaching? can you be reaching? can he be reaching? can we be reaching? can you be reaching? can they be reaching?
Perfect
can I have reached? can you have reached? can he have reached? can we have reached? can you have reached? can they have reached?
V-ing perfect
can I have been reaching? can you have been reaching? can he have been reaching? can we have been reaching? can you have been reaching? can they have been reaching?
Interro-negative form
Simple form
can I not reach? can you not reach? can he not reach? can we not reach? can you not reach? can they not reach?
V-ing form
can I not be reaching? can you not be reaching? can he not be reaching? can we not be reaching? can you not be reaching? can they not be reaching?
Perfect
can I not have reached? can you not have reached? can he not have reached? can we not have reached? can you not have reached? can they not have reached?
V-ing perfect
can I not have been reaching? can you not have been reaching? can he not have been reaching? can we not have been reaching? can you not have been reaching? can they not have been reaching?