could flag
Verbo regular: flag - flagged- flagged

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

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

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

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