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