could conceal
Verbo regular: conceal - concealed- concealed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could conceal
you could conceal
he could conceal
we could conceal
you could conceal
they could conceal 	I could be concealing
you could be concealing
he could be concealing
we could be concealing
you could be concealing
they could be concealing	I could have concealed
you could have concealed
he could have concealed
we could have concealed
you could have concealed
they could have concealed	I could have been concealing
you could have been concealing
he could have been concealing
we could have been concealing
you could have been concealing
they could have been concealing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't conceal
you couldn't conceal
he couldn't conceal
we couldn't conceal
you couldn't conceal
they couldn't conceal 	I couldn't be concealing
you couldn't be concealing
he couldn't be concealing
we couldn't be concealing
you couldn't be concealing
they couldn't be concealing	I couldn't have concealed
you couldn't have concealed
he couldn't have concealed
we couldn't have concealed
you couldn't have concealed
they couldn't have concealed	I couldn't have been concealing
you couldn't have been concealing
he couldn't have been concealing
we couldn't have been concealing
you couldn't have been concealing
they couldn't have been concealing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I conceal?
could you conceal?
could he conceal?
could we conceal?
could you conceal?
could they conceal? 	could I be concealing?
could you be concealing?
could he be concealing?
could we be concealing?
could you be concealing?
could they be concealing? 	could I have concealed?
could you have concealed?
could he have concealed?
could we have concealed?
could you have concealed?
could they have concealed? 	could I have been concealing?
could you have been concealing?
could he have been concealing?
could we have been concealing?
could you have been concealing?
could they have been concealing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I conceal?
couldn't you conceal?
couldn't he conceal?
couldn't we conceal?
couldn't you conceal?
couldn't they conceal? 	couldn't I be concealing?
couldn't you be concealing?
couldn't he be concealing?
couldn't we be concealing?
couldn't you be concealing?
couldn't they be concealing? 	couldn't I have concealed?
couldn't you have concealed?
couldn't he have concealed?
couldn't we have concealed?
couldn't you have concealed?
couldn't they have concealed? 	couldn't I have been concealing?
couldn't you have been concealing?
couldn't he have been concealing?
couldn't we have been concealing?
couldn't you have been concealing?
couldn't they have been concealing?