I could assort you could assort she could assort we could assort you could assort they could assort
V-ing form
I could be assorting you could be assorting she could be assorting we could be assorting you could be assorting they could be assorting
Perfect
I could have assorted you could have assorted she 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 she could have been assorting we could have been assorting you could have been assorting they could have been assorting
Negation
Simple form
I couldn't assort you couldn't assort she couldn't assort we couldn't assort you couldn't assort they couldn't assort
V-ing form
I couldn't be assorting you couldn't be assorting she couldn't be assorting we couldn't be assorting you couldn't be assorting they couldn't be assorting
Perfect
I couldn't have assorted you couldn't have assorted she couldn't have assorted we couldn't have assorted you couldn't have assorted they couldn't have assorted
V-ing perfect
I couldn't have been assorting you couldn't have been assorting she couldn't have been assorting we couldn't have been assorting you couldn't have been assorting they couldn't have been assorting
Interrogative form
Simple form
could I assort? could you assort? could she assort? could we assort? could you assort? could they assort?
V-ing form
could I be assorting? could you be assorting? could she be assorting? could we be assorting? could you be assorting? could they be assorting?
Perfect
could I have assorted? could you have assorted? could she 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 she have been assorting? could we have been assorting? could you have been assorting? could they have been assorting?
Interro-negative form
Simple form
couldn't I assort? couldn't you assort? couldn't she assort? couldn't we assort? couldn't you assort? couldn't they assort?
V-ing form
couldn't I be assorting? couldn't you be assorting? couldn't she be assorting? couldn't we be assorting? couldn't you be assorting? couldn't they be assorting?
Perfect
couldn't I have assorted? couldn't you have assorted? couldn't she have assorted? couldn't we have assorted? couldn't you have assorted? couldn't they have assorted?
V-ing perfect
couldn't I have been assorting? couldn't you have been assorting? couldn't she have been assorting? couldn't we have been assorting? couldn't you have been assorting? couldn't they have been assorting?