must prevent
Verbo regolare: prevent - prevented- prevented

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must prevent
you must prevent
he must prevent
we must prevent
you must prevent
they must prevent 	I must be preventing
you must be preventing
he must be preventing
we must be preventing
you must be preventing
they must be preventing	I must have prevented
you must have prevented
he must have prevented
we must have prevented
you must have prevented
they must have prevented	I must have been preventing
you must have been preventing
he must have been preventing
we must have been preventing
you must have been preventing
they must have been preventing	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not prevent
you must not prevent
he must not prevent
we must not prevent
you must not prevent
they must not prevent 	I must not be preventing
you must not be preventing
he must not be preventing
we must not be preventing
you must not be preventing
they must not be preventing	I must not have prevented
you must not have prevented
he must not have prevented
we must not have prevented
you must not have prevented
they must not have prevented	I must not have been preventing
you must not have been preventing
he must not have been preventing
we must not have been preventing
you must not have been preventing
they must not have been preventing	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I prevent?
must you prevent?
must he prevent?
must we prevent?
must you prevent?
must they prevent? 	must I be preventing?
must you be preventing?
must he be preventing?
must we be preventing?
must you be preventing?
must they be preventing? 	must I have prevented?
must you have prevented?
must he have prevented?
must we have prevented?
must you have prevented?
must they have prevented? 	must I have been preventing?
must you have been preventing?
must he have been preventing?
must we have been preventing?
must you have been preventing?
must they have been preventing? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not prevent?
must you not prevent?
must he not prevent?
must we not prevent?
must you not prevent?
must they not prevent? 	must I not be preventing?
must you not be preventing?
must he not be preventing?
must we not be preventing?
must you not be preventing?
must they not be preventing? 	must I not have prevented?
must you not have prevented?
must he not have prevented?
must we not have prevented?
must you not have prevented?
must they not have prevented? 	must I not have been preventing?
must you not have been preventing?
must he not have been preventing?
must we not have been preventing?
must you not have been preventing?
must they not have been preventing?