I'd be backspacing you'd be backspacing he'd be backspacing we'd be backspacing you'd be backspacing they'd be backspacing
Perfect
I should've backspaced you should've backspaced he should've backspaced we should've backspaced you should've backspaced they should've backspaced
V-ing perfect
I should've been backspacing you should've been backspacing he should've been backspacing we should've been backspacing you should've been backspacing they should've been backspacing
Negation
Simple form
I shouldn't backspace you shouldn't backspace he shouldn't backspace we shouldn't backspace you shouldn't backspace they shouldn't backspace
V-ing form
I shouldn't be backspacing you shouldn't be backspacing he shouldn't be backspacing we shouldn't be backspacing you shouldn't be backspacing they shouldn't be backspacing
Perfect
I shouldn't have backspaced you shouldn't have backspaced he shouldn't have backspaced we shouldn't have backspaced you shouldn't have backspaced they shouldn't have backspaced
V-ing perfect
I shouldn't have been backspacing you shouldn't have been backspacing he shouldn't have been backspacing we shouldn't have been backspacing you shouldn't have been backspacing they shouldn't have been backspacing
Interrogative form
Simple form
should I backspace? should you backspace? should he backspace? should we backspace? should you backspace? should they backspace?
V-ing form
should I be backspacing? should you be backspacing? should he be backspacing? should we be backspacing? should you be backspacing? should they be backspacing?
Perfect
should I have backspaced? should you have backspaced? should he have backspaced? should we have backspaced? should you have backspaced? should they have backspaced?
V-ing perfect
should I have been backspacing? should you have been backspacing? should he have been backspacing? should we have been backspacing? should you have been backspacing? should they have been backspacing?
Interro-negative form
Simple form
shouldn't I backspace? shouldn't you backspace? shouldn't he backspace? shouldn't we backspace? shouldn't you backspace? shouldn't they backspace?
V-ing form
shouldn't I be backspacing? shouldn't you be backspacing? shouldn't he be backspacing? shouldn't we be backspacing? shouldn't you be backspacing? shouldn't they be backspacing?
Perfect
shouldn't I have backspaced? shouldn't you have backspaced? shouldn't he have backspaced? shouldn't we have backspaced? shouldn't you have backspaced? shouldn't they have backspaced?
V-ing perfect
shouldn't I have been backspacing? shouldn't you have been backspacing? shouldn't he have been backspacing? shouldn't we have been backspacing? shouldn't you have been backspacing? shouldn't they have been backspacing?