I could hide you could hide he could hide we could hide you could hide they could hide
V-ing form
I could be hiding you could be hiding he could be hiding we could be hiding you could be hiding they could be hiding
Perfect
I could have hidden you could have hidden he could have hidden we could have hidden you could have hidden they could have hidden
V-ing perfect
I could have been hiding you could have been hiding he could have been hiding we could have been hiding you could have been hiding they could have been hiding
Negation
Simple form
I couldn't hide you couldn't hide he couldn't hide we couldn't hide you couldn't hide they couldn't hide
V-ing form
I couldn't be hiding you couldn't be hiding he couldn't be hiding we couldn't be hiding you couldn't be hiding they couldn't be hiding
Perfect
I couldn't have hidden you couldn't have hidden he couldn't have hidden we couldn't have hidden you couldn't have hidden they couldn't have hidden
V-ing perfect
I couldn't have been hiding you couldn't have been hiding he couldn't have been hiding we couldn't have been hiding you couldn't have been hiding they couldn't have been hiding
Interrogative form
Simple form
could I hide? could you hide? could he hide? could we hide? could you hide? could they hide?
V-ing form
could I be hiding? could you be hiding? could he be hiding? could we be hiding? could you be hiding? could they be hiding?
Perfect
could I have hidden? could you have hidden? could he have hidden? could we have hidden? could you have hidden? could they have hidden?
V-ing perfect
could I have been hiding? could you have been hiding? could he have been hiding? could we have been hiding? could you have been hiding? could they have been hiding?
Interro-negative form
Simple form
couldn't I hide? couldn't you hide? couldn't he hide? couldn't we hide? couldn't you hide? couldn't they hide?
V-ing form
couldn't I be hiding? couldn't you be hiding? couldn't he be hiding? couldn't we be hiding? couldn't you be hiding? couldn't they be hiding?
Perfect
couldn't I have hidden? couldn't you have hidden? couldn't he have hidden? couldn't we have hidden? couldn't you have hidden? couldn't they have hidden?
V-ing perfect
couldn't I have been hiding? couldn't you have been hiding? couldn't he have been hiding? couldn't we have been hiding? couldn't you have been hiding? couldn't they have been hiding?