I could hear you could hear he could hear we could hear you could hear they could hear
V-ing form
I could be hearing you could be hearing he could be hearing we could be hearing you could be hearing they could be hearing
Perfect
I could have heard you could have heard he 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 he 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 he 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 he 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 he 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 he 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 he hear? could we hear? could you hear? could they hear?
V-ing form
could I be hearing? could you be hearing? could he be hearing? could we be hearing? could you be hearing? could they be hearing?
Perfect
could I have heard? could you have heard? could he 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 he 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 he 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 he 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 he 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 he have been hearing? couldn't we have been hearing? couldn't you have been hearing? couldn't they have been hearing?