should preserve
Verbo regular: preserve - preserved- preserved

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I'd preserve
you'd preserve
he'd preserve
we'd preserve
you'd preserve
they'd preserve 	I'd be preserving
you'd be preserving
he'd be preserving
we'd be preserving
you'd be preserving
they'd be preserving	I should've preserved
you should've preserved
he should've preserved
we should've preserved
you should've preserved
they should've preserved	I should've been preserving
you should've been preserving
he should've been preserving
we should've been preserving
you should've been preserving
they should've been preserving	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I shouldn't preserve
you shouldn't preserve
he shouldn't preserve
we shouldn't preserve
you shouldn't preserve
they shouldn't preserve 	I shouldn't be preserving
you shouldn't be preserving
he shouldn't be preserving
we shouldn't be preserving
you shouldn't be preserving
they shouldn't be preserving	I shouldn't have preserved
you shouldn't have preserved
he shouldn't have preserved
we shouldn't have preserved
you shouldn't have preserved
they shouldn't have preserved	I shouldn't have been preserving
you shouldn't have been preserving
he shouldn't have been preserving
we shouldn't have been preserving
you shouldn't have been preserving
they shouldn't have been preserving	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I preserve?
should you preserve?
should he preserve?
should we preserve?
should you preserve?
should they preserve? 	should I be preserving?
should you be preserving?
should he be preserving?
should we be preserving?
should you be preserving?
should they be preserving? 	should I have preserved?
should you have preserved?
should he have preserved?
should we have preserved?
should you have preserved?
should they have preserved? 	should I have been preserving?
should you have been preserving?
should he have been preserving?
should we have been preserving?
should you have been preserving?
should they have been preserving? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
shouldn't I preserve?
shouldn't you preserve?
shouldn't he preserve?
shouldn't we preserve?
shouldn't you preserve?
shouldn't they preserve? 	shouldn't I be preserving?
shouldn't you be preserving?
shouldn't he be preserving?
shouldn't we be preserving?
shouldn't you be preserving?
shouldn't they be preserving? 	shouldn't I have preserved?
shouldn't you have preserved?
shouldn't he have preserved?
shouldn't we have preserved?
shouldn't you have preserved?
shouldn't they have preserved? 	shouldn't I have been preserving?
shouldn't you have been preserving?
shouldn't he have been preserving?
shouldn't we have been preserving?
shouldn't you have been preserving?
shouldn't they have been preserving?