I could escape you could escape she could escape we could escape you could escape they could escape
V-ing form
I could be escaping you could be escaping she could be escaping we could be escaping you could be escaping they could be escaping
Perfect
I could have escaped you could have escaped she could have escaped we could have escaped you could have escaped they could have escaped
V-ing perfect
I could have been escaping you could have been escaping she could have been escaping we could have been escaping you could have been escaping they could have been escaping
Negation
Simple form
I could not escape you could not escape she could not escape we could not escape you could not escape they could not escape
V-ing form
I could not be escaping you could not be escaping she could not be escaping we could not be escaping you could not be escaping they could not be escaping
Perfect
I could not have escaped you could not have escaped she could not have escaped we could not have escaped you could not have escaped they could not have escaped
V-ing perfect
I could not have been escaping you could not have been escaping she could not have been escaping we could not have been escaping you could not have been escaping they could not have been escaping
Interrogative form
Simple form
could I escape? could you escape? could she escape? could we escape? could you escape? could they escape?
V-ing form
could I be escaping? could you be escaping? could she be escaping? could we be escaping? could you be escaping? could they be escaping?
Perfect
could I have escaped? could you have escaped? could she have escaped? could we have escaped? could you have escaped? could they have escaped?
V-ing perfect
could I have been escaping? could you have been escaping? could she have been escaping? could we have been escaping? could you have been escaping? could they have been escaping?
Interro-negative form
Simple form
could I not escape? could you not escape? could she not escape? could we not escape? could you not escape? could they not escape?
V-ing form
could I not be escaping? could you not be escaping? could she not be escaping? could we not be escaping? could you not be escaping? could they not be escaping?
Perfect
could I not have escaped? could you not have escaped? could she not have escaped? could we not have escaped? could you not have escaped? could they not have escaped?
V-ing perfect
could I not have been escaping? could you not have been escaping? could she not have been escaping? could we not have been escaping? could you not have been escaping? could they not have been escaping?