I could stink you could stink she could stink we could stink you could stink they could stink
V-ing form
I could be stinking you could be stinking she could be stinking we could be stinking you could be stinking they could be stinking
Perfect
I could have stunk you could have stunk she could have stunk we could have stunk you could have stunk they could have stunk
V-ing perfect
I could have been stinking you could have been stinking she could have been stinking we could have been stinking you could have been stinking they could have been stinking
Negation
Simple form
I could not stink you could not stink she could not stink we could not stink you could not stink they could not stink
V-ing form
I could not be stinking you could not be stinking she could not be stinking we could not be stinking you could not be stinking they could not be stinking
Perfect
I could not have stunk you could not have stunk she could not have stunk we could not have stunk you could not have stunk they could not have stunk
V-ing perfect
I could not have been stinking you could not have been stinking she could not have been stinking we could not have been stinking you could not have been stinking they could not have been stinking
Interrogative form
Simple form
could I stink? could you stink? could she stink? could we stink? could you stink? could they stink?
V-ing form
could I be stinking? could you be stinking? could she be stinking? could we be stinking? could you be stinking? could they be stinking?
Perfect
could I have stunk? could you have stunk? could she have stunk? could we have stunk? could you have stunk? could they have stunk?
V-ing perfect
could I have been stinking? could you have been stinking? could she have been stinking? could we have been stinking? could you have been stinking? could they have been stinking?
Interro-negative form
Simple form
could I not stink? could you not stink? could she not stink? could we not stink? could you not stink? could they not stink?
V-ing form
could I not be stinking? could you not be stinking? could she not be stinking? could we not be stinking? could you not be stinking? could they not be stinking?
Perfect
could I not have stunk? could you not have stunk? could she not have stunk? could we not have stunk? could you not have stunk? could they not have stunk?
V-ing perfect
could I not have been stinking? could you not have been stinking? could she not have been stinking? could we not have been stinking? could you not have been stinking? could they not have been stinking?