I could backlist you could backlist he could backlist we could backlist you could backlist they could backlist
V-ing form
I could be backlisting you could be backlisting he could be backlisting we could be backlisting you could be backlisting they could be backlisting
Perfect
I could have backlisted you could have backlisted he 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 he 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 he 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 he 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 he 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 he 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 he backlist? could we backlist? could you backlist? could they backlist?
V-ing form
could I be backlisting? could you be backlisting? could he be backlisting? could we be backlisting? could you be backlisting? could they be backlisting?
Perfect
could I have backlisted? could you have backlisted? could he 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 he 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 he 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 he 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 he 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 he have been backlisting? couldn't we have been backlisting? couldn't you have been backlisting? couldn't they have been backlisting?