must source
Verbo regular: source - sourced- sourced

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must source
you must source
she must source
we must source
you must source
they must source 	I must be sourcing
you must be sourcing
she must be sourcing
we must be sourcing
you must be sourcing
they must be sourcing	I must have sourced
you must have sourced
she 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
she must have been sourcing
we must have been sourcing
you must have been sourcing
they must have been sourcing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not source
you must not source
she must not source
we must not source
you must not source
they must not source 	I must not be sourcing
you must not be sourcing
she must not be sourcing
we must not be sourcing
you must not be sourcing
they must not be sourcing	I must not have sourced
you must not have sourced
she must not have sourced
we must not have sourced
you must not have sourced
they must not have sourced	I must not have been sourcing
you must not have been sourcing
she must not have been sourcing
we must not have been sourcing
you must not have been sourcing
they must not have been sourcing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I source?
must you source?
must she source?
must we source?
must you source?
must they source? 	must I be sourcing?
must you be sourcing?
must she be sourcing?
must we be sourcing?
must you be sourcing?
must they be sourcing? 	must I have sourced?
must you have sourced?
must she 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 she have been sourcing?
must we have been sourcing?
must you have been sourcing?
must they have been sourcing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not source?
must you not source?
must she not source?
must we not source?
must you not source?
must they not source? 	must I not be sourcing?
must you not be sourcing?
must she not be sourcing?
must we not be sourcing?
must you not be sourcing?
must they not be sourcing? 	must I not have sourced?
must you not have sourced?
must she not have sourced?
must we not have sourced?
must you not have sourced?
must they not have sourced? 	must I not have been sourcing?
must you not have been sourcing?
must she not have been sourcing?
must we not have been sourcing?
must you not have been sourcing?
must they not have been sourcing?