I could hear you could hear she could hear we could hear you could hear they could hear
V-ing form
I could be hearing you could be hearing she could be hearing we could be hearing you could be hearing they could be hearing
Perfect
I could have heard you could have heard she could have heard we could have heard you could have heard they could have heard
V-ing perfect
I could have been hearing you could have been hearing she could have been hearing we could have been hearing you could have been hearing they could have been hearing
Negation
Simple form
I couldn't hear you couldn't hear she couldn't hear we couldn't hear you couldn't hear they couldn't hear
V-ing form
I couldn't be hearing you couldn't be hearing she couldn't be hearing we couldn't be hearing you couldn't be hearing they couldn't be hearing
Perfect
I couldn't have heard you couldn't have heard she couldn't have heard we couldn't have heard you couldn't have heard they couldn't have heard
V-ing perfect
I couldn't have been hearing you couldn't have been hearing she couldn't have been hearing we couldn't have been hearing you couldn't have been hearing they couldn't have been hearing
Interrogative form
Simple form
could I hear? could you hear? could she hear? could we hear? could you hear? could they hear?
V-ing form
could I be hearing? could you be hearing? could she be hearing? could we be hearing? could you be hearing? could they be hearing?
Perfect
could I have heard? could you have heard? could she have heard? could we have heard? could you have heard? could they have heard?
V-ing perfect
could I have been hearing? could you have been hearing? could she have been hearing? could we have been hearing? could you have been hearing? could they have been hearing?
Interro-negative form
Simple form
couldn't I hear? couldn't you hear? couldn't she hear? couldn't we hear? couldn't you hear? couldn't they hear?
V-ing form
couldn't I be hearing? couldn't you be hearing? couldn't she be hearing? couldn't we be hearing? couldn't you be hearing? couldn't they be hearing?
Perfect
couldn't I have heard? couldn't you have heard? couldn't she have heard? couldn't we have heard? couldn't you have heard? couldn't they have heard?
V-ing perfect
couldn't I have been hearing? couldn't you have been hearing? couldn't she have been hearing? couldn't we have been hearing? couldn't you have been hearing? couldn't they have been hearing?