must undersign
Verbo regolare: undersign - undersigned- undersigned

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must undersign
you must undersign
he must undersign
we must undersign
you must undersign
they must undersign 	I must be undersigning
you must be undersigning
he must be undersigning
we must be undersigning
you must be undersigning
they must be undersigning	I must have undersigned
you must have undersigned
he must have undersigned
we must have undersigned
you must have undersigned
they must have undersigned	I must have been undersigning
you must have been undersigning
he must have been undersigning
we must have been undersigning
you must have been undersigning
they must have been undersigning	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not undersign
you must not undersign
he must not undersign
we must not undersign
you must not undersign
they must not undersign 	I must not be undersigning
you must not be undersigning
he must not be undersigning
we must not be undersigning
you must not be undersigning
they must not be undersigning	I must not have undersigned
you must not have undersigned
he must not have undersigned
we must not have undersigned
you must not have undersigned
they must not have undersigned	I must not have been undersigning
you must not have been undersigning
he must not have been undersigning
we must not have been undersigning
you must not have been undersigning
they must not have been undersigning	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I undersign?
must you undersign?
must he undersign?
must we undersign?
must you undersign?
must they undersign? 	must I be undersigning?
must you be undersigning?
must he be undersigning?
must we be undersigning?
must you be undersigning?
must they be undersigning? 	must I have undersigned?
must you have undersigned?
must he have undersigned?
must we have undersigned?
must you have undersigned?
must they have undersigned? 	must I have been undersigning?
must you have been undersigning?
must he have been undersigning?
must we have been undersigning?
must you have been undersigning?
must they have been undersigning? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not undersign?
must you not undersign?
must he not undersign?
must we not undersign?
must you not undersign?
must they not undersign? 	must I not be undersigning?
must you not be undersigning?
must he not be undersigning?
must we not be undersigning?
must you not be undersigning?
must they not be undersigning? 	must I not have undersigned?
must you not have undersigned?
must he not have undersigned?
must we not have undersigned?
must you not have undersigned?
must they not have undersigned? 	must I not have been undersigning?
must you not have been undersigning?
must he not have been undersigning?
must we not have been undersigning?
must you not have been undersigning?
must they not have been undersigning?