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 can't react you can't react he can't react we can't react you can't react they can't react
V-ing form
I can't be reacting you can't be reacting he can't be reacting we can't be reacting you can't be reacting they can't be reacting
Perfect
I can't have reacted you can't have reacted he can't have reacted we can't have reacted you can't have reacted they can't have reacted
V-ing perfect
I can't have been reacting you can't have been reacting he can't have been reacting we can't have been reacting you can't have been reacting they can't 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't I react? can't you react? can't he react? can't we react? can't you react? can't they react?
V-ing form
can't I be reacting? can't you be reacting? can't he be reacting? can't we be reacting? can't you be reacting? can't they be reacting?
Perfect
can't I have reacted? can't you have reacted? can't he have reacted? can't we have reacted? can't you have reacted? can't they have reacted?
V-ing perfect
can't I have been reacting? can't you have been reacting? can't he have been reacting? can't we have been reacting? can't you have been reacting? can't they have been reacting?