must undertake
Verbo irregolare: undertake - undertook- undertaken

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must undertake
you must undertake
she must undertake
we must undertake
you must undertake
they must undertake 	I must be undertaking
you must be undertaking
she must be undertaking
we must be undertaking
you must be undertaking
they must be undertaking	I must have undertaken
you must have undertaken
she must have undertaken
we must have undertaken
you must have undertaken
they must have undertaken	I must have been undertaking
you must have been undertaking
she must have been undertaking
we must have been undertaking
you must have been undertaking
they must have been undertaking	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not undertake
you must not undertake
she must not undertake
we must not undertake
you must not undertake
they must not undertake 	I must not be undertaking
you must not be undertaking
she must not be undertaking
we must not be undertaking
you must not be undertaking
they must not be undertaking	I must not have undertaken
you must not have undertaken
she must not have undertaken
we must not have undertaken
you must not have undertaken
they must not have undertaken	I must not have been undertaking
you must not have been undertaking
she must not have been undertaking
we must not have been undertaking
you must not have been undertaking
they must not have been undertaking	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I undertake?
must you undertake?
must she undertake?
must we undertake?
must you undertake?
must they undertake? 	must I be undertaking?
must you be undertaking?
must she be undertaking?
must we be undertaking?
must you be undertaking?
must they be undertaking? 	must I have undertaken?
must you have undertaken?
must she have undertaken?
must we have undertaken?
must you have undertaken?
must they have undertaken? 	must I have been undertaking?
must you have been undertaking?
must she have been undertaking?
must we have been undertaking?
must you have been undertaking?
must they have been undertaking? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not undertake?
must you not undertake?
must she not undertake?
must we not undertake?
must you not undertake?
must they not undertake? 	must I not be undertaking?
must you not be undertaking?
must she not be undertaking?
must we not be undertaking?
must you not be undertaking?
must they not be undertaking? 	must I not have undertaken?
must you not have undertaken?
must she not have undertaken?
must we not have undertaken?
must you not have undertaken?
must they not have undertaken? 	must I not have been undertaking?
must you not have been undertaking?
must she not have been undertaking?
must we not have been undertaking?
must you not have been undertaking?
must they not have been undertaking?