I can react you can react he can react we can react you can react they can react
V-ing form
I can be reacting you can be reacting he can be reacting we can be reacting you can be reacting they can be reacting
Perfect
I can have reacted you can have reacted he can have reacted we can have reacted you can have reacted they can have reacted
V-ing perfect
I can have been reacting you can have been reacting he can have been reacting we can have been reacting you can have been reacting they can have been reacting
Negation
Simple form
I cannot react you cannot react he cannot react we cannot react you cannot react they cannot react
V-ing form
I cannot be reacting you cannot be reacting he cannot be reacting we cannot be reacting you cannot be reacting they cannot be reacting
Perfect
I cannot have reacted you cannot have reacted he cannot have reacted we cannot have reacted you cannot have reacted they cannot have reacted
V-ing perfect
I cannot have been reacting you cannot have been reacting he cannot have been reacting we cannot have been reacting you cannot have been reacting they cannot have been reacting
Interrogative form
Simple form
can I react? can you react? can he react? can we react? can you react? can they react?
V-ing form
can I be reacting? can you be reacting? can he be reacting? can we be reacting? can you be reacting? can they be reacting?
Perfect
can I have reacted? can you have reacted? can he have reacted? can we have reacted? can you have reacted? can they have reacted?
V-ing perfect
can I have been reacting? can you have been reacting? can he have been reacting? can we have been reacting? can you have been reacting? can they have been reacting?
Interro-negative form
Simple form
can I not react? can you not react? can he not react? can we not react? can you not react? can they not react?
V-ing form
can I not be reacting? can you not be reacting? can he not be reacting? can we not be reacting? can you not be reacting? can they not be reacting?
Perfect
can I not have reacted? can you not have reacted? can he not have reacted? can we not have reacted? can you not have reacted? can they not have reacted?
V-ing perfect
can I not have been reacting? can you not have been reacting? can he not have been reacting? can we not have been reacting? can you not have been reacting? can they not have been reacting?