must commence
Verbo regular: commence - commenced- commenced

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must commence
you must commence
he must commence
we must commence
you must commence
they must commence 	I must be commencing
you must be commencing
he must be commencing
we must be commencing
you must be commencing
they must be commencing	I must have commenced
you must have commenced
he must have commenced
we must have commenced
you must have commenced
they must have commenced	I must have been commencing
you must have been commencing
he must have been commencing
we must have been commencing
you must have been commencing
they must have been commencing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not commence
you must not commence
he must not commence
we must not commence
you must not commence
they must not commence 	I must not be commencing
you must not be commencing
he must not be commencing
we must not be commencing
you must not be commencing
they must not be commencing	I must not have commenced
you must not have commenced
he must not have commenced
we must not have commenced
you must not have commenced
they must not have commenced	I must not have been commencing
you must not have been commencing
he must not have been commencing
we must not have been commencing
you must not have been commencing
they must not have been commencing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I commence?
must you commence?
must he commence?
must we commence?
must you commence?
must they commence? 	must I be commencing?
must you be commencing?
must he be commencing?
must we be commencing?
must you be commencing?
must they be commencing? 	must I have commenced?
must you have commenced?
must he have commenced?
must we have commenced?
must you have commenced?
must they have commenced? 	must I have been commencing?
must you have been commencing?
must he have been commencing?
must we have been commencing?
must you have been commencing?
must they have been commencing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not commence?
must you not commence?
must he not commence?
must we not commence?
must you not commence?
must they not commence? 	must I not be commencing?
must you not be commencing?
must he not be commencing?
must we not be commencing?
must you not be commencing?
must they not be commencing? 	must I not have commenced?
must you not have commenced?
must he not have commenced?
must we not have commenced?
must you not have commenced?
must they not have commenced? 	must I not have been commencing?
must you not have been commencing?
must he not have been commencing?
must we not have been commencing?
must you not have been commencing?
must they not have been commencing?