I'll be backspacing you'll be backspacing he'll be backspacing we'll be backspacing you'll be backspacing they'll be backspacing
Future perfect
I'll have backspaced you'll have backspaced he'll have backspaced we'll have backspaced you'll have backspaced they'll have backspaced
Future perfect continuous
I'll have been backspacing you'll have been backspacing he'll have been backspacing we'll have been backspacing you'll have been backspacing they'll have been backspacing
I'd be backspacing you'd be backspacing he'd be backspacing we'd be backspacing you'd be backspacing they'd be backspacing
Past
I'd have backspaced you'd have backspaced he'd have backspaced we'd have backspaced you'd have backspaced they'd have backspaced
Past continuous
I'd have been backspacing you'd have been backspacing he'd have been backspacing we'd have been backspacing you'd have been backspacing they'd have been backspacing