must witness
Verbo regolare: witness - witnessed- witnessed

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must witness
you must witness
he must witness
we must witness
you must witness
they must witness 	I must be witnessing
you must be witnessing
he must be witnessing
we must be witnessing
you must be witnessing
they must be witnessing	I must have witnessed
you must have witnessed
he must have witnessed
we must have witnessed
you must have witnessed
they must have witnessed	I must have been witnessing
you must have been witnessing
he must have been witnessing
we must have been witnessing
you must have been witnessing
they must have been witnessing	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not witness
you must not witness
he must not witness
we must not witness
you must not witness
they must not witness 	I must not be witnessing
you must not be witnessing
he must not be witnessing
we must not be witnessing
you must not be witnessing
they must not be witnessing	I must not have witnessed
you must not have witnessed
he must not have witnessed
we must not have witnessed
you must not have witnessed
they must not have witnessed	I must not have been witnessing
you must not have been witnessing
he must not have been witnessing
we must not have been witnessing
you must not have been witnessing
they must not have been witnessing	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I witness?
must you witness?
must he witness?
must we witness?
must you witness?
must they witness? 	must I be witnessing?
must you be witnessing?
must he be witnessing?
must we be witnessing?
must you be witnessing?
must they be witnessing? 	must I have witnessed?
must you have witnessed?
must he have witnessed?
must we have witnessed?
must you have witnessed?
must they have witnessed? 	must I have been witnessing?
must you have been witnessing?
must he have been witnessing?
must we have been witnessing?
must you have been witnessing?
must they have been witnessing? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not witness?
must you not witness?
must he not witness?
must we not witness?
must you not witness?
must they not witness? 	must I not be witnessing?
must you not be witnessing?
must he not be witnessing?
must we not be witnessing?
must you not be witnessing?
must they not be witnessing? 	must I not have witnessed?
must you not have witnessed?
must he not have witnessed?
must we not have witnessed?
must you not have witnessed?
must they not have witnessed? 	must I not have been witnessing?
must you not have been witnessing?
must he not have been witnessing?
must we not have been witnessing?
must you not have been witnessing?
must they not have been witnessing?