I could assort you could assort he could assort we could assort you could assort they could assort
V-ing form
I could be assorting you could be assorting he could be assorting we could be assorting you could be assorting they could be assorting
Perfect
I could have assorted you could have assorted he could have assorted we could have assorted you could have assorted they could have assorted
V-ing perfect
I could have been assorting you could have been assorting he could have been assorting we could have been assorting you could have been assorting they could have been assorting
Negation
Simple form
I could not assort you could not assort he could not assort we could not assort you could not assort they could not assort
V-ing form
I could not be assorting you could not be assorting he could not be assorting we could not be assorting you could not be assorting they could not be assorting
Perfect
I could not have assorted you could not have assorted he could not have assorted we could not have assorted you could not have assorted they could not have assorted
V-ing perfect
I could not have been assorting you could not have been assorting he could not have been assorting we could not have been assorting you could not have been assorting they could not have been assorting
Interrogative form
Simple form
could I assort? could you assort? could he assort? could we assort? could you assort? could they assort?
V-ing form
could I be assorting? could you be assorting? could he be assorting? could we be assorting? could you be assorting? could they be assorting?
Perfect
could I have assorted? could you have assorted? could he have assorted? could we have assorted? could you have assorted? could they have assorted?
V-ing perfect
could I have been assorting? could you have been assorting? could he have been assorting? could we have been assorting? could you have been assorting? could they have been assorting?
Interro-negative form
Simple form
could I not assort? could you not assort? could he not assort? could we not assort? could you not assort? could they not assort?
V-ing form
could I not be assorting? could you not be assorting? could he not be assorting? could we not be assorting? could you not be assorting? could they not be assorting?
Perfect
could I not have assorted? could you not have assorted? could he not have assorted? could we not have assorted? could you not have assorted? could they not have assorted?
V-ing perfect
could I not have been assorting? could you not have been assorting? could he not have been assorting? could we not have been assorting? could you not have been assorting? could they not have been assorting?