must observe
Verbe régulier : observe - observed- observed
Traduction française : observer - (faire) remarquer 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en 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	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not observe
you must not observe
she must not observe
we must not observe
you must not observe
they must not observe 	I must not be observing
you must not be observing
she must not be observing
we must not be observing
you must not be observing
they must not be observing	I must not have observed
you must not have observed
she must not have observed
we must not have observed
you must not have observed
they must not have observed	I must not have been observing
you must not have been observing
she must not have been observing
we must not have been observing
you must not have been observing
they must not have been observing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en 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? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not observe?
must you not observe?
must she not observe?
must we not observe?
must you not observe?
must they not observe? 	must I not be observing?
must you not be observing?
must she not be observing?
must we not be observing?
must you not be observing?
must they not be observing? 	must I not have observed?
must you not have observed?
must she not have observed?
must we not have observed?
must you not have observed?
must they not have observed? 	must I not have been observing?
must you not have been observing?
must she not have been observing?
must we not have been observing?
must you not have been observing?
must they not have been observing?