English verb conjugation
COULD CONCEAL

Regular verb: conceal - concealed - concealed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I couldn't conceal you couldn't conceal she 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 she couldn't be concealing we couldn't be concealing you couldn't be concealing they couldn't be concealing
Perfect	V-ing perfect
I couldn't have concealed you couldn't have concealed she 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 she couldn't have been concealing we couldn't have been concealing you couldn't have been concealing they couldn't have been concealing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
couldn't I conceal? couldn't you conceal? couldn't she 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 she be concealing? couldn't we be concealing? couldn't you be concealing? couldn't they be concealing?
Perfect	V-ing perfect
couldn't I have concealed? couldn't you have concealed? couldn't she 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 she have been concealing? couldn't we have been concealing? couldn't you have been concealing? couldn't they have been concealing?