could conceal
Regular verb: conceal - concealed- concealed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could conceal
you could conceal
she could conceal
we could conceal
you could conceal
they could conceal 	I could be concealing
you could be concealing
she could be concealing
we could be concealing
you could be concealing
they could be concealing	I could have concealed
you could have concealed
she 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
she could have been concealing
we could have been concealing
you could have been concealing
they could have been concealing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not conceal
you could not conceal
she could not conceal
we could not conceal
you could not conceal
they could not conceal 	I could not be concealing
you could not be concealing
she could not be concealing
we could not be concealing
you could not be concealing
they could not be concealing	I could not have concealed
you could not have concealed
she could not have concealed
we could not have concealed
you could not have concealed
they could not have concealed	I could not have been concealing
you could not have been concealing
she could not have been concealing
we could not have been concealing
you could not have been concealing
they could not have been concealing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I conceal?
could you conceal?
could she conceal?
could we conceal?
could you conceal?
could they conceal? 	could I be concealing?
could you be concealing?
could she be concealing?
could we be concealing?
could you be concealing?
could they be concealing? 	could I have concealed?
could you have concealed?
could she 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 she have been concealing?
could we have been concealing?
could you have been concealing?
could they have been concealing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not conceal?
could you not conceal?
could she not conceal?
could we not conceal?
could you not conceal?
could they not conceal? 	could I not be concealing?
could you not be concealing?
could she not be concealing?
could we not be concealing?
could you not be concealing?
could they not be concealing? 	could I not have concealed?
could you not have concealed?
could she not have concealed?
could we not have concealed?
could you not have concealed?
could they not have concealed? 	could I not have been concealing?
could you not have been concealing?
could she not have been concealing?
could we not have been concealing?
could you not have been concealing?
could they not have been concealing?