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
she must undersign
we must undersign
you must undersign
they must undersign 	I must be undersigning
you must be undersigning
she must be undersigning
we must be undersigning
you must be undersigning
they must be undersigning	I must have undersigned
you must have undersigned
she 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
she 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
she 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
she 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
she 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
she 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 she undersign?
must we undersign?
must you undersign?
must they undersign? 	must I be undersigning?
must you be undersigning?
must she be undersigning?
must we be undersigning?
must you be undersigning?
must they be undersigning? 	must I have undersigned?
must you have undersigned?
must she 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 she 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 she 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 she 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 she 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 she not have been undersigning?
must we not have been undersigning?
must you not have been undersigning?
must they not have been undersigning?