must source
Verbo regolare: source - sourced- sourced

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must source
you must source
he must source
we must source
you must source
they must source 	I must be sourcing
you must be sourcing
he must be sourcing
we must be sourcing
you must be sourcing
they must be sourcing	I must have sourced
you must have sourced
he must have sourced
we must have sourced
you must have sourced
they must have sourced	I must have been sourcing
you must have been sourcing
he must have been sourcing
we must have been sourcing
you must have been sourcing
they must have been sourcing	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I mustn't source
you mustn't source
he mustn't source
we mustn't source
you mustn't source
they mustn't source 	I mustn't be sourcing
you mustn't be sourcing
he mustn't be sourcing
we mustn't be sourcing
you mustn't be sourcing
they mustn't be sourcing	I mustn't have sourced
you mustn't have sourced
he mustn't have sourced
we mustn't have sourced
you mustn't have sourced
they mustn't have sourced	I mustn't have been sourcing
you mustn't have been sourcing
he mustn't have been sourcing
we mustn't have been sourcing
you mustn't have been sourcing
they mustn't have been sourcing	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I source?
must you source?
must he source?
must we source?
must you source?
must they source? 	must I be sourcing?
must you be sourcing?
must he be sourcing?
must we be sourcing?
must you be sourcing?
must they be sourcing? 	must I have sourced?
must you have sourced?
must he have sourced?
must we have sourced?
must you have sourced?
must they have sourced? 	must I have been sourcing?
must you have been sourcing?
must he have been sourcing?
must we have been sourcing?
must you have been sourcing?
must they have been sourcing? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
mustn't I source?
mustn't you source?
mustn't he source?
mustn't we source?
mustn't you source?
mustn't they source? 	mustn't I be sourcing?
mustn't you be sourcing?
mustn't he be sourcing?
mustn't we be sourcing?
mustn't you be sourcing?
mustn't they be sourcing? 	mustn't I have sourced?
mustn't you have sourced?
mustn't he have sourced?
mustn't we have sourced?
mustn't you have sourced?
mustn't they have sourced? 	mustn't I have been sourcing?
mustn't you have been sourcing?
mustn't he have been sourcing?
mustn't we have been sourcing?
mustn't you have been sourcing?
mustn't they have been sourcing?