could backspace
Regular verb: backspace - backspaced- backspaced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could backspace
you could backspace
she could backspace
we could backspace
you could backspace
they could backspace 	I could be backspacing
you could be backspacing
she could be backspacing
we could be backspacing
you could be backspacing
they could be backspacing	I could have backspaced
you could have backspaced
she could have backspaced
we could have backspaced
you could have backspaced
they could have backspaced	I could have been backspacing
you could have been backspacing
she could have been backspacing
we could have been backspacing
you could have been backspacing
they could have been backspacing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't backspace
you couldn't backspace
she couldn't backspace
we couldn't backspace
you couldn't backspace
they couldn't backspace 	I couldn't be backspacing
you couldn't be backspacing
she couldn't be backspacing
we couldn't be backspacing
you couldn't be backspacing
they couldn't be backspacing	I couldn't have backspaced
you couldn't have backspaced
she couldn't have backspaced
we couldn't have backspaced
you couldn't have backspaced
they couldn't have backspaced	I couldn't have been backspacing
you couldn't have been backspacing
she couldn't have been backspacing
we couldn't have been backspacing
you couldn't have been backspacing
they couldn't have been backspacing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I backspace?
could you backspace?
could she backspace?
could we backspace?
could you backspace?
could they backspace? 	could I be backspacing?
could you be backspacing?
could she be backspacing?
could we be backspacing?
could you be backspacing?
could they be backspacing? 	could I have backspaced?
could you have backspaced?
could she have backspaced?
could we have backspaced?
could you have backspaced?
could they have backspaced? 	could I have been backspacing?
could you have been backspacing?
could she have been backspacing?
could we have been backspacing?
could you have been backspacing?
could they have been backspacing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I backspace?
couldn't you backspace?
couldn't she backspace?
couldn't we backspace?
couldn't you backspace?
couldn't they backspace? 	couldn't I be backspacing?
couldn't you be backspacing?
couldn't she be backspacing?
couldn't we be backspacing?
couldn't you be backspacing?
couldn't they be backspacing? 	couldn't I have backspaced?
couldn't you have backspaced?
couldn't she have backspaced?
couldn't we have backspaced?
couldn't you have backspaced?
couldn't they have backspaced? 	couldn't I have been backspacing?
couldn't you have been backspacing?
couldn't she have been backspacing?
couldn't we have been backspacing?
couldn't you have been backspacing?
couldn't they have been backspacing?