should observe
Verbo regular: observe - observed- observed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I'd observe
you'd observe
she'd observe
we'd observe
you'd observe
they'd observe 	I'd be observing
you'd be observing
she'd be observing
we'd be observing
you'd be observing
they'd be observing	I should've observed
you should've observed
she should've observed
we should've observed
you should've observed
they should've observed	I should've been observing
you should've been observing
she should've been observing
we should've been observing
you should've been observing
they should've been observing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I shouldn't observe
you shouldn't observe
she shouldn't observe
we shouldn't observe
you shouldn't observe
they shouldn't observe 	I shouldn't be observing
you shouldn't be observing
she shouldn't be observing
we shouldn't be observing
you shouldn't be observing
they shouldn't be observing	I shouldn't have observed
you shouldn't have observed
she shouldn't have observed
we shouldn't have observed
you shouldn't have observed
they shouldn't have observed	I shouldn't have been observing
you shouldn't have been observing
she shouldn't have been observing
we shouldn't have been observing
you shouldn't have been observing
they shouldn't have been observing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I observe?
should you observe?
should she observe?
should we observe?
should you observe?
should they observe? 	should I be observing?
should you be observing?
should she be observing?
should we be observing?
should you be observing?
should they be observing? 	should I have observed?
should you have observed?
should she have observed?
should we have observed?
should you have observed?
should they have observed? 	should I have been observing?
should you have been observing?
should she have been observing?
should we have been observing?
should you have been observing?
should they have been observing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
shouldn't I observe?
shouldn't you observe?
shouldn't she observe?
shouldn't we observe?
shouldn't you observe?
shouldn't they observe? 	shouldn't I be observing?
shouldn't you be observing?
shouldn't she be observing?
shouldn't we be observing?
shouldn't you be observing?
shouldn't they be observing? 	shouldn't I have observed?
shouldn't you have observed?
shouldn't she have observed?
shouldn't we have observed?
shouldn't you have observed?
shouldn't they have observed? 	shouldn't I have been observing?
shouldn't you have been observing?
shouldn't she have been observing?
shouldn't we have been observing?
shouldn't you have been observing?
shouldn't they have been observing?