I could backfit you could backfit she could backfit we could backfit you could backfit they could backfit
V-ing form
I could be backfiting you could be backfiting she could be backfiting we could be backfiting you could be backfiting they could be backfiting
Perfect
I could have backfit, backfitted you could have backfit, backfitted she could have backfit, backfitted we could have backfit, backfitted you could have backfit, backfitted they could have backfit, backfitted
V-ing perfect
I could have been backfiting you could have been backfiting she could have been backfiting we could have been backfiting you could have been backfiting they could have been backfiting
Negation
Simple form
I could not backfit you could not backfit she could not backfit we could not backfit you could not backfit they could not backfit
V-ing form
I could not be backfiting you could not be backfiting she could not be backfiting we could not be backfiting you could not be backfiting they could not be backfiting
Perfect
I could not have backfit, backfitted you could not have backfit, backfitted she could not have backfit, backfitted we could not have backfit, backfitted you could not have backfit, backfitted they could not have backfit, backfitted
V-ing perfect
I could not have been backfiting you could not have been backfiting she could not have been backfiting we could not have been backfiting you could not have been backfiting they could not have been backfiting
Interrogative form
Simple form
could I backfit? could you backfit? could she backfit? could we backfit? could you backfit? could they backfit?
V-ing form
could I be backfiting? could you be backfiting? could she be backfiting? could we be backfiting? could you be backfiting? could they be backfiting?
Perfect
could I have backfit, backfitted? could you have backfit, backfitted? could she have backfit, backfitted? could we have backfit, backfitted? could you have backfit, backfitted? could they have backfit, backfitted?
V-ing perfect
could I have been backfiting? could you have been backfiting? could she have been backfiting? could we have been backfiting? could you have been backfiting? could they have been backfiting?
Interro-negative form
Simple form
could I not backfit? could you not backfit? could she not backfit? could we not backfit? could you not backfit? could they not backfit?
V-ing form
could I not be backfiting? could you not be backfiting? could she not be backfiting? could we not be backfiting? could you not be backfiting? could they not be backfiting?
Perfect
could I not have backfit, backfitted? could you not have backfit, backfitted? could she not have backfit, backfitted? could we not have backfit, backfitted? could you not have backfit, backfitted? could they not have backfit, backfitted?
V-ing perfect
could I not have been backfiting? could you not have been backfiting? could she not have been backfiting? could we not have been backfiting? could you not have been backfiting? could they not have been backfiting?