should observe
Regular verb: observe - observed- observed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should observe
you should observe
she should observe
we should observe
you should observe
they should observe 	I should be observing
you should be observing
she should be observing
we should be observing
you should be observing
they should be observing	I should have observed
you should have observed
she 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
she should have been observing
we should have been observing
you should have been observing
they should have been observing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not observe
you should not observe
she 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
she 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
she 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
she should not have been observing
we should not have been observing
you should not have been observing
they should not have been observing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not observe?
should you not observe?
should she 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 she 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 she 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 she not have been observing?
should we not have been observing?
should you not have been observing?
should they not have been observing?