should observe
Verbo regular: observe - observed- observed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I should observe
you should observe
he should observe
we should observe
you should observe
they should observe 	I should be observing
you should be observing
he should be observing
we should be observing
you should be observing
they should be observing	I should have observed
you should have observed
he should have observed
we should have observed
you should have observed
they should have observed	I should have been observing
you should have been observing
he should have been observing
we should have been observing
you should have been observing
they should have been observing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I should not observe
you should not observe
he should not observe
we should not observe
you should not observe
they should not observe 	I should not be observing
you should not be observing
he should not be observing
we should not be observing
you should not be observing
they should not be observing	I should not have observed
you should not have observed
he should not have observed
we should not have observed
you should not have observed
they should not have observed	I should not have been observing
you should not have been observing
he should not have been observing
we should not have been observing
you should not have been observing
they should not have been observing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I observe?
should you observe?
should he observe?
should we observe?
should you observe?
should they observe? 	should I be observing?
should you be observing?
should he be observing?
should we be observing?
should you be observing?
should they be observing? 	should I have observed?
should you have observed?
should he 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 he have been observing?
should we have been observing?
should you have been observing?
should they have been observing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I not observe?
should you not observe?
should he not observe?
should we not observe?
should you not observe?
should they not observe? 	should I not be observing?
should you not be observing?
should he not be observing?
should we not be observing?
should you not be observing?
should they not be observing? 	should I not have observed?
should you not have observed?
should he not have observed?
should we not have observed?
should you not have observed?
should they not have observed? 	should I not have been observing?
should you not have been observing?
should he not have been observing?
should we not have been observing?
should you not have been observing?
should they not have been observing?