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