I could alight you could alight he could alight we could alight you could alight they could alight
V-ing form
I could be alighting you could be alighting he could be alighting we could be alighting you could be alighting they could be alighting
Perfect
I could have alighted you could have alighted he could have alighted we could have alighted you could have alighted they could have alighted
V-ing perfect
I could have been alighting you could have been alighting he could have been alighting we could have been alighting you could have been alighting they could have been alighting
Negation
Simple form
I could not alight you could not alight he could not alight we could not alight you could not alight they could not alight
V-ing form
I could not be alighting you could not be alighting he could not be alighting we could not be alighting you could not be alighting they could not be alighting
Perfect
I could not have alighted you could not have alighted he could not have alighted we could not have alighted you could not have alighted they could not have alighted
V-ing perfect
I could not have been alighting you could not have been alighting he could not have been alighting we could not have been alighting you could not have been alighting they could not have been alighting
Interrogative form
Simple form
could I alight? could you alight? could he alight? could we alight? could you alight? could they alight?
V-ing form
could I be alighting? could you be alighting? could he be alighting? could we be alighting? could you be alighting? could they be alighting?
Perfect
could I have alighted? could you have alighted? could he have alighted? could we have alighted? could you have alighted? could they have alighted?
V-ing perfect
could I have been alighting? could you have been alighting? could he have been alighting? could we have been alighting? could you have been alighting? could they have been alighting?
Interro-negative form
Simple form
could I not alight? could you not alight? could he not alight? could we not alight? could you not alight? could they not alight?
V-ing form
could I not be alighting? could you not be alighting? could he not be alighting? could we not be alighting? could you not be alighting? could they not be alighting?
Perfect
could I not have alighted? could you not have alighted? could he not have alighted? could we not have alighted? could you not have alighted? could they not have alighted?
V-ing perfect
could I not have been alighting? could you not have been alighting? could he not have been alighting? could we not have been alighting? could you not have been alighting? could they not have been alighting?