must observe
Verbo regolare: observe - observed- observed

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must observe
you must observe
she must observe
we must observe
you must observe
they must observe 	I must be observing
you must be observing
she must be observing
we must be observing
you must be observing
they must be observing	I must have observed
you must have observed
she must have observed
we must have observed
you must have observed
they must have observed	I must have been observing
you must have been observing
she must have been observing
we must have been observing
you must have been observing
they must have been observing	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I mustn't observe
you mustn't observe
she mustn't observe
we mustn't observe
you mustn't observe
they mustn't observe 	I mustn't be observing
you mustn't be observing
she mustn't be observing
we mustn't be observing
you mustn't be observing
they mustn't be observing	I mustn't have observed
you mustn't have observed
she mustn't have observed
we mustn't have observed
you mustn't have observed
they mustn't have observed	I mustn't have been observing
you mustn't have been observing
she mustn't have been observing
we mustn't have been observing
you mustn't have been observing
they mustn't have been observing	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I observe?
must you observe?
must she observe?
must we observe?
must you observe?
must they observe? 	must I be observing?
must you be observing?
must she be observing?
must we be observing?
must you be observing?
must they be observing? 	must I have observed?
must you have observed?
must she have observed?
must we have observed?
must you have observed?
must they have observed? 	must I have been observing?
must you have been observing?
must she have been observing?
must we have been observing?
must you have been observing?
must they have been observing? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
mustn't I observe?
mustn't you observe?
mustn't she observe?
mustn't we observe?
mustn't you observe?
mustn't they observe? 	mustn't I be observing?
mustn't you be observing?
mustn't she be observing?
mustn't we be observing?
mustn't you be observing?
mustn't they be observing? 	mustn't I have observed?
mustn't you have observed?
mustn't she have observed?
mustn't we have observed?
mustn't you have observed?
mustn't they have observed? 	mustn't I have been observing?
mustn't you have been observing?
mustn't she have been observing?
mustn't we have been observing?
mustn't you have been observing?
mustn't they have been observing?