should lack
Verbo regular: lack - lacked- lacked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I'd lack
you'd lack
he'd lack
we'd lack
you'd lack
they'd lack 	I'd be lacking
you'd be lacking
he'd be lacking
we'd be lacking
you'd be lacking
they'd be lacking	I should've lacked
you should've lacked
he should've lacked
we should've lacked
you should've lacked
they should've lacked	I should've been lacking
you should've been lacking
he should've been lacking
we should've been lacking
you should've been lacking
they should've been lacking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I shouldn't lack
you shouldn't lack
he shouldn't lack
we shouldn't lack
you shouldn't lack
they shouldn't lack 	I shouldn't be lacking
you shouldn't be lacking
he shouldn't be lacking
we shouldn't be lacking
you shouldn't be lacking
they shouldn't be lacking	I shouldn't have lacked
you shouldn't have lacked
he shouldn't have lacked
we shouldn't have lacked
you shouldn't have lacked
they shouldn't have lacked	I shouldn't have been lacking
you shouldn't have been lacking
he shouldn't have been lacking
we shouldn't have been lacking
you shouldn't have been lacking
they shouldn't have been lacking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I lack?
should you lack?
should he lack?
should we lack?
should you lack?
should they lack? 	should I be lacking?
should you be lacking?
should he be lacking?
should we be lacking?
should you be lacking?
should they be lacking? 	should I have lacked?
should you have lacked?
should he have lacked?
should we have lacked?
should you have lacked?
should they have lacked? 	should I have been lacking?
should you have been lacking?
should he have been lacking?
should we have been lacking?
should you have been lacking?
should they have been lacking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
shouldn't I lack?
shouldn't you lack?
shouldn't he lack?
shouldn't we lack?
shouldn't you lack?
shouldn't they lack? 	shouldn't I be lacking?
shouldn't you be lacking?
shouldn't he be lacking?
shouldn't we be lacking?
shouldn't you be lacking?
shouldn't they be lacking? 	shouldn't I have lacked?
shouldn't you have lacked?
shouldn't he have lacked?
shouldn't we have lacked?
shouldn't you have lacked?
shouldn't they have lacked? 	shouldn't I have been lacking?
shouldn't you have been lacking?
shouldn't he have been lacking?
shouldn't we have been lacking?
shouldn't you have been lacking?
shouldn't they have been lacking?