I could exit you could exit he could exit we could exit you could exit they could exit
V-ing form
I could be exiting you could be exiting he could be exiting we could be exiting you could be exiting they could be exiting
Perfect
I could have exited you could have exited he could have exited we could have exited you could have exited they could have exited
V-ing perfect
I could have been exiting you could have been exiting he could have been exiting we could have been exiting you could have been exiting they could have been exiting
Negation
Simple form
I couldn't exit you couldn't exit he couldn't exit we couldn't exit you couldn't exit they couldn't exit
V-ing form
I couldn't be exiting you couldn't be exiting he couldn't be exiting we couldn't be exiting you couldn't be exiting they couldn't be exiting
Perfect
I couldn't have exited you couldn't have exited he couldn't have exited we couldn't have exited you couldn't have exited they couldn't have exited
V-ing perfect
I couldn't have been exiting you couldn't have been exiting he couldn't have been exiting we couldn't have been exiting you couldn't have been exiting they couldn't have been exiting
Interrogative form
Simple form
could I exit? could you exit? could he exit? could we exit? could you exit? could they exit?
V-ing form
could I be exiting? could you be exiting? could he be exiting? could we be exiting? could you be exiting? could they be exiting?
Perfect
could I have exited? could you have exited? could he have exited? could we have exited? could you have exited? could they have exited?
V-ing perfect
could I have been exiting? could you have been exiting? could he have been exiting? could we have been exiting? could you have been exiting? could they have been exiting?
Interro-negative form
Simple form
couldn't I exit? couldn't you exit? couldn't he exit? couldn't we exit? couldn't you exit? couldn't they exit?
V-ing form
couldn't I be exiting? couldn't you be exiting? couldn't he be exiting? couldn't we be exiting? couldn't you be exiting? couldn't they be exiting?
Perfect
couldn't I have exited? couldn't you have exited? couldn't he have exited? couldn't we have exited? couldn't you have exited? couldn't they have exited?
V-ing perfect
couldn't I have been exiting? couldn't you have been exiting? couldn't he have been exiting? couldn't we have been exiting? couldn't you have been exiting? couldn't they have been exiting?