must backbite
Verbo irregular: backbite - backbit- backbitten

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must backbite
you must backbite
he must backbite
we must backbite
you must backbite
they must backbite 	I must be backbiting
you must be backbiting
he must be backbiting
we must be backbiting
you must be backbiting
they must be backbiting	I must have backbitten
you must have backbitten
he must have backbitten
we must have backbitten
you must have backbitten
they must have backbitten	I must have been backbiting
you must have been backbiting
he must have been backbiting
we must have been backbiting
you must have been backbiting
they must have been backbiting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not backbite
you must not backbite
he must not backbite
we must not backbite
you must not backbite
they must not backbite 	I must not be backbiting
you must not be backbiting
he must not be backbiting
we must not be backbiting
you must not be backbiting
they must not be backbiting	I must not have backbitten
you must not have backbitten
he must not have backbitten
we must not have backbitten
you must not have backbitten
they must not have backbitten	I must not have been backbiting
you must not have been backbiting
he must not have been backbiting
we must not have been backbiting
you must not have been backbiting
they must not have been backbiting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I backbite?
must you backbite?
must he backbite?
must we backbite?
must you backbite?
must they backbite? 	must I be backbiting?
must you be backbiting?
must he be backbiting?
must we be backbiting?
must you be backbiting?
must they be backbiting? 	must I have backbitten?
must you have backbitten?
must he have backbitten?
must we have backbitten?
must you have backbitten?
must they have backbitten? 	must I have been backbiting?
must you have been backbiting?
must he have been backbiting?
must we have been backbiting?
must you have been backbiting?
must they have been backbiting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not backbite?
must you not backbite?
must he not backbite?
must we not backbite?
must you not backbite?
must they not backbite? 	must I not be backbiting?
must you not be backbiting?
must he not be backbiting?
must we not be backbiting?
must you not be backbiting?
must they not be backbiting? 	must I not have backbitten?
must you not have backbitten?
must he not have backbitten?
must we not have backbitten?
must you not have backbitten?
must they not have backbitten? 	must I not have been backbiting?
must you not have been backbiting?
must he not have been backbiting?
must we not have been backbiting?
must you not have been backbiting?
must they not have been backbiting?