I could flee you could flee he could flee we could flee you could flee they could flee
V-ing form
I could be fleeing you could be fleeing he could be fleeing we could be fleeing you could be fleeing they could be fleeing
Perfect
I could have fled you could have fled he could have fled we could have fled you could have fled they could have fled
V-ing perfect
I could have been fleeing you could have been fleeing he could have been fleeing we could have been fleeing you could have been fleeing they could have been fleeing
Negation
Simple form
I could not flee you could not flee he could not flee we could not flee you could not flee they could not flee
V-ing form
I could not be fleeing you could not be fleeing he could not be fleeing we could not be fleeing you could not be fleeing they could not be fleeing
Perfect
I could not have fled you could not have fled he could not have fled we could not have fled you could not have fled they could not have fled
V-ing perfect
I could not have been fleeing you could not have been fleeing he could not have been fleeing we could not have been fleeing you could not have been fleeing they could not have been fleeing
Interrogative form
Simple form
could I flee? could you flee? could he flee? could we flee? could you flee? could they flee?
V-ing form
could I be fleeing? could you be fleeing? could he be fleeing? could we be fleeing? could you be fleeing? could they be fleeing?
Perfect
could I have fled? could you have fled? could he have fled? could we have fled? could you have fled? could they have fled?
V-ing perfect
could I have been fleeing? could you have been fleeing? could he have been fleeing? could we have been fleeing? could you have been fleeing? could they have been fleeing?
Interro-negative form
Simple form
could I not flee? could you not flee? could he not flee? could we not flee? could you not flee? could they not flee?
V-ing form
could I not be fleeing? could you not be fleeing? could he not be fleeing? could we not be fleeing? could you not be fleeing? could they not be fleeing?
Perfect
could I not have fled? could you not have fled? could he not have fled? could we not have fled? could you not have fled? could they not have fled?
V-ing perfect
could I not have been fleeing? could you not have been fleeing? could he not have been fleeing? could we not have been fleeing? could you not have been fleeing? could they not have been fleeing?