must back
Verbo regolare: back - backed- backed

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must back
you must back
he must back
we must back
you must back
they must back 	I must be backing
you must be backing
he must be backing
we must be backing
you must be backing
they must be backing	I must have backed
you must have backed
he must have backed
we must have backed
you must have backed
they must have backed	I must have been backing
you must have been backing
he must have been backing
we must have been backing
you must have been backing
they must have been backing	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not back
you must not back
he must not back
we must not back
you must not back
they must not back 	I must not be backing
you must not be backing
he must not be backing
we must not be backing
you must not be backing
they must not be backing	I must not have backed
you must not have backed
he must not have backed
we must not have backed
you must not have backed
they must not have backed	I must not have been backing
you must not have been backing
he must not have been backing
we must not have been backing
you must not have been backing
they must not have been backing	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I back?
must you back?
must he back?
must we back?
must you back?
must they back? 	must I be backing?
must you be backing?
must he be backing?
must we be backing?
must you be backing?
must they be backing? 	must I have backed?
must you have backed?
must he have backed?
must we have backed?
must you have backed?
must they have backed? 	must I have been backing?
must you have been backing?
must he have been backing?
must we have been backing?
must you have been backing?
must they have been backing? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not back?
must you not back?
must he not back?
must we not back?
must you not back?
must they not back? 	must I not be backing?
must you not be backing?
must he not be backing?
must we not be backing?
must you not be backing?
must they not be backing? 	must I not have backed?
must you not have backed?
must he not have backed?
must we not have backed?
must you not have backed?
must they not have backed? 	must I not have been backing?
must you not have been backing?
must he not have been backing?
must we not have been backing?
must you not have been backing?
must they not have been backing?