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