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
she must regret
we must regret
you must regret
they must regret 	I must be regreting
you must be regreting
she must be regreting
we must be regreting
you must be regreting
they must be regreting	I must have regreted
you must have regreted
she 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
she 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 must not regret
you must not regret
she must not regret
we must not regret
you must not regret
they must not regret 	I must not be regreting
you must not be regreting
she must not be regreting
we must not be regreting
you must not be regreting
they must not be regreting	I must not have regreted
you must not have regreted
she must not have regreted
we must not have regreted
you must not have regreted
they must not have regreted	I must not have been regreting
you must not have been regreting
she must not have been regreting
we must not have been regreting
you must not have been regreting
they must not have been regreting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I regret?
must you regret?
must she regret?
must we regret?
must you regret?
must they regret? 	must I be regreting?
must you be regreting?
must she be regreting?
must we be regreting?
must you be regreting?
must they be regreting? 	must I have regreted?
must you have regreted?
must she 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 she 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 	
must I not regret?
must you not regret?
must she not regret?
must we not regret?
must you not regret?
must they not regret? 	must I not be regreting?
must you not be regreting?
must she not be regreting?
must we not be regreting?
must you not be regreting?
must they not be regreting? 	must I not have regreted?
must you not have regreted?
must she not have regreted?
must we not have regreted?
must you not have regreted?
must they not have regreted? 	must I not have been regreting?
must you not have been regreting?
must she not have been regreting?
must we not have been regreting?
must you not have been regreting?
must they not have been regreting?