I'd back you'd back he'd back we'd back you'd back they'd back
Forma con V-ing
I'd be backing you'd be backing he'd be backing we'd be backing you'd be backing they'd be backing
Perfecto
I should've backed you should've backed he should've backed we should've backed you should've backed they should've backed
Perfecto con V-ing
I should've been backing you should've been backing he should've been backing we should've been backing you should've been backing they should've been backing
Negación
Forma simple
I shouldn't back you shouldn't back he shouldn't back we shouldn't back you shouldn't back they shouldn't back
Forma con V-ing
I shouldn't be backing you shouldn't be backing he shouldn't be backing we shouldn't be backing you shouldn't be backing they shouldn't be backing
Perfecto
I shouldn't have backed you shouldn't have backed he shouldn't have backed we shouldn't have backed you shouldn't have backed they shouldn't have backed
Perfecto con V-ing
I shouldn't have been backing you shouldn't have been backing he shouldn't have been backing we shouldn't have been backing you shouldn't have been backing they shouldn't have been backing
Forma interrogativa
Forma simple
should I back? should you back? should he back? should we back? should you back? should they back?
Forma con V-ing
should I be backing? should you be backing? should he be backing? should we be backing? should you be backing? should they be backing?
Perfecto
should I have backed? should you have backed? should he have backed? should we have backed? should you have backed? should they have backed?
Perfecto con V-ing
should I have been backing? should you have been backing? should he have been backing? should we have been backing? should you have been backing? should they have been backing?
Forma interro-negativa
Forma simple
shouldn't I back? shouldn't you back? shouldn't he back? shouldn't we back? shouldn't you back? shouldn't they back?
Forma con V-ing
shouldn't I be backing? shouldn't you be backing? shouldn't he be backing? shouldn't we be backing? shouldn't you be backing? shouldn't they be backing?
Perfecto
shouldn't I have backed? shouldn't you have backed? shouldn't he have backed? shouldn't we have backed? shouldn't you have backed? shouldn't they have backed?
Perfecto con V-ing
shouldn't I have been backing? shouldn't you have been backing? shouldn't he have been backing? shouldn't we have been backing? shouldn't you have been backing? shouldn't they have been backing?