must prolong
Verbo regolare: prolong - prolonged- prolonged

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must prolong
you must prolong
he must prolong
we must prolong
you must prolong
they must prolong 	I must be prolonging
you must be prolonging
he must be prolonging
we must be prolonging
you must be prolonging
they must be prolonging	I must have prolonged
you must have prolonged
he must have prolonged
we must have prolonged
you must have prolonged
they must have prolonged	I must have been prolonging
you must have been prolonging
he must have been prolonging
we must have been prolonging
you must have been prolonging
they must have been prolonging	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not prolong
you must not prolong
he must not prolong
we must not prolong
you must not prolong
they must not prolong 	I must not be prolonging
you must not be prolonging
he must not be prolonging
we must not be prolonging
you must not be prolonging
they must not be prolonging	I must not have prolonged
you must not have prolonged
he must not have prolonged
we must not have prolonged
you must not have prolonged
they must not have prolonged	I must not have been prolonging
you must not have been prolonging
he must not have been prolonging
we must not have been prolonging
you must not have been prolonging
they must not have been prolonging	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I prolong?
must you prolong?
must he prolong?
must we prolong?
must you prolong?
must they prolong? 	must I be prolonging?
must you be prolonging?
must he be prolonging?
must we be prolonging?
must you be prolonging?
must they be prolonging? 	must I have prolonged?
must you have prolonged?
must he have prolonged?
must we have prolonged?
must you have prolonged?
must they have prolonged? 	must I have been prolonging?
must you have been prolonging?
must he have been prolonging?
must we have been prolonging?
must you have been prolonging?
must they have been prolonging? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not prolong?
must you not prolong?
must he not prolong?
must we not prolong?
must you not prolong?
must they not prolong? 	must I not be prolonging?
must you not be prolonging?
must he not be prolonging?
must we not be prolonging?
must you not be prolonging?
must they not be prolonging? 	must I not have prolonged?
must you not have prolonged?
must he not have prolonged?
must we not have prolonged?
must you not have prolonged?
must they not have prolonged? 	must I not have been prolonging?
must you not have been prolonging?
must he not have been prolonging?
must we not have been prolonging?
must you not have been prolonging?
must they not have been prolonging?