must regret
Verbo regular: regret - regreted- regreted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must regret
you must regret
he must regret
we must regret
you must regret
they must regret 	I must be regreting
you must be regreting
he must be regreting
we must be regreting
you must be regreting
they must be regreting	I must have regreted
you must have regreted
he must have regreted
we must have regreted
you must have regreted
they must have regreted	I must have been regreting
you must have been regreting
he must have been regreting
we must have been regreting
you must have been regreting
they must have been regreting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't regret
you mustn't regret
he mustn't regret
we mustn't regret
you mustn't regret
they mustn't regret 	I mustn't be regreting
you mustn't be regreting
he mustn't be regreting
we mustn't be regreting
you mustn't be regreting
they mustn't be regreting	I mustn't have regreted
you mustn't have regreted
he mustn't have regreted
we mustn't have regreted
you mustn't have regreted
they mustn't have regreted	I mustn't have been regreting
you mustn't have been regreting
he mustn't have been regreting
we mustn't have been regreting
you mustn't have been regreting
they mustn't have been regreting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I regret?
must you regret?
must he regret?
must we regret?
must you regret?
must they regret? 	must I be regreting?
must you be regreting?
must he be regreting?
must we be regreting?
must you be regreting?
must they be regreting? 	must I have regreted?
must you have regreted?
must he have regreted?
must we have regreted?
must you have regreted?
must they have regreted? 	must I have been regreting?
must you have been regreting?
must he have been regreting?
must we have been regreting?
must you have been regreting?
must they have been regreting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I regret?
mustn't you regret?
mustn't he regret?
mustn't we regret?
mustn't you regret?
mustn't they regret? 	mustn't I be regreting?
mustn't you be regreting?
mustn't he be regreting?
mustn't we be regreting?
mustn't you be regreting?
mustn't they be regreting? 	mustn't I have regreted?
mustn't you have regreted?
mustn't he have regreted?
mustn't we have regreted?
mustn't you have regreted?
mustn't they have regreted? 	mustn't I have been regreting?
mustn't you have been regreting?
mustn't he have been regreting?
mustn't we have been regreting?
mustn't you have been regreting?
mustn't they have been regreting?