must flag
Verbo regular: flag - flagged- flagged

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must flag
you must flag
she must flag
we must flag
you must flag
they must flag 	I must be flagging
you must be flagging
she must be flagging
we must be flagging
you must be flagging
they must be flagging	I must have flagged
you must have flagged
she must have flagged
we must have flagged
you must have flagged
they must have flagged	I must have been flagging
you must have been flagging
she must have been flagging
we must have been flagging
you must have been flagging
they must have been flagging	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not flag
you must not flag
she must not flag
we must not flag
you must not flag
they must not flag 	I must not be flagging
you must not be flagging
she must not be flagging
we must not be flagging
you must not be flagging
they must not be flagging	I must not have flagged
you must not have flagged
she must not have flagged
we must not have flagged
you must not have flagged
they must not have flagged	I must not have been flagging
you must not have been flagging
she must not have been flagging
we must not have been flagging
you must not have been flagging
they must not have been flagging	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I flag?
must you flag?
must she flag?
must we flag?
must you flag?
must they flag? 	must I be flagging?
must you be flagging?
must she be flagging?
must we be flagging?
must you be flagging?
must they be flagging? 	must I have flagged?
must you have flagged?
must she have flagged?
must we have flagged?
must you have flagged?
must they have flagged? 	must I have been flagging?
must you have been flagging?
must she have been flagging?
must we have been flagging?
must you have been flagging?
must they have been flagging? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not flag?
must you not flag?
must she not flag?
must we not flag?
must you not flag?
must they not flag? 	must I not be flagging?
must you not be flagging?
must she not be flagging?
must we not be flagging?
must you not be flagging?
must they not be flagging? 	must I not have flagged?
must you not have flagged?
must she not have flagged?
must we not have flagged?
must you not have flagged?
must they not have flagged? 	must I not have been flagging?
must you not have been flagging?
must she not have been flagging?
must we not have been flagging?
must you not have been flagging?
must they not have been flagging?