I could pursue you could pursue he could pursue we could pursue you could pursue they could pursue
V-ing form
I could be pursuing you could be pursuing he could be pursuing we could be pursuing you could be pursuing they could be pursuing
Perfect
I could have pursued you could have pursued he could have pursued we could have pursued you could have pursued they could have pursued
V-ing perfect
I could have been pursuing you could have been pursuing he could have been pursuing we could have been pursuing you could have been pursuing they could have been pursuing
Negation
Simple form
I could not pursue you could not pursue he could not pursue we could not pursue you could not pursue they could not pursue
V-ing form
I could not be pursuing you could not be pursuing he could not be pursuing we could not be pursuing you could not be pursuing they could not be pursuing
Perfect
I could not have pursued you could not have pursued he could not have pursued we could not have pursued you could not have pursued they could not have pursued
V-ing perfect
I could not have been pursuing you could not have been pursuing he could not have been pursuing we could not have been pursuing you could not have been pursuing they could not have been pursuing
Interrogative form
Simple form
could I pursue? could you pursue? could he pursue? could we pursue? could you pursue? could they pursue?
V-ing form
could I be pursuing? could you be pursuing? could he be pursuing? could we be pursuing? could you be pursuing? could they be pursuing?
Perfect
could I have pursued? could you have pursued? could he have pursued? could we have pursued? could you have pursued? could they have pursued?
V-ing perfect
could I have been pursuing? could you have been pursuing? could he have been pursuing? could we have been pursuing? could you have been pursuing? could they have been pursuing?
Interro-negative form
Simple form
could I not pursue? could you not pursue? could he not pursue? could we not pursue? could you not pursue? could they not pursue?
V-ing form
could I not be pursuing? could you not be pursuing? could he not be pursuing? could we not be pursuing? could you not be pursuing? could they not be pursuing?
Perfect
could I not have pursued? could you not have pursued? could he not have pursued? could we not have pursued? could you not have pursued? could they not have pursued?
V-ing perfect
could I not have been pursuing? could you not have been pursuing? could he not have been pursuing? could we not have been pursuing? could you not have been pursuing? could they not have been pursuing?