I could track you could track he could track we could track you could track they could track
V-ing form
I could be tracking you could be tracking he could be tracking we could be tracking you could be tracking they could be tracking
Perfect
I could have tracked you could have tracked he could have tracked we could have tracked you could have tracked they could have tracked
V-ing perfect
I could have been tracking you could have been tracking he could have been tracking we could have been tracking you could have been tracking they could have been tracking
Negation
Simple form
I could not track you could not track he could not track we could not track you could not track they could not track
V-ing form
I could not be tracking you could not be tracking he could not be tracking we could not be tracking you could not be tracking they could not be tracking
Perfect
I could not have tracked you could not have tracked he could not have tracked we could not have tracked you could not have tracked they could not have tracked
V-ing perfect
I could not have been tracking you could not have been tracking he could not have been tracking we could not have been tracking you could not have been tracking they could not have been tracking
Interrogative form
Simple form
could I track? could you track? could he track? could we track? could you track? could they track?
V-ing form
could I be tracking? could you be tracking? could he be tracking? could we be tracking? could you be tracking? could they be tracking?
Perfect
could I have tracked? could you have tracked? could he have tracked? could we have tracked? could you have tracked? could they have tracked?
V-ing perfect
could I have been tracking? could you have been tracking? could he have been tracking? could we have been tracking? could you have been tracking? could they have been tracking?
Interro-negative form
Simple form
could I not track? could you not track? could he not track? could we not track? could you not track? could they not track?
V-ing form
could I not be tracking? could you not be tracking? could he not be tracking? could we not be tracking? could you not be tracking? could they not be tracking?
Perfect
could I not have tracked? could you not have tracked? could he not have tracked? could we not have tracked? could you not have tracked? could they not have tracked?
V-ing perfect
could I not have been tracking? could you not have been tracking? could he not have been tracking? could we not have been tracking? could you not have been tracking? could they not have been tracking?