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