I could bury you could bury she could bury we could bury you could bury they could bury
V-ing form
I could be burying you could be burying she could be burying we could be burying you could be burying they could be burying
Perfect
I could have buried you could have buried she could have buried we could have buried you could have buried they could have buried
V-ing perfect
I could have been burying you could have been burying she could have been burying we could have been burying you could have been burying they could have been burying
Negation
Simple form
I could not bury you could not bury she could not bury we could not bury you could not bury they could not bury
V-ing form
I could not be burying you could not be burying she could not be burying we could not be burying you could not be burying they could not be burying
Perfect
I could not have buried you could not have buried she could not have buried we could not have buried you could not have buried they could not have buried
V-ing perfect
I could not have been burying you could not have been burying she could not have been burying we could not have been burying you could not have been burying they could not have been burying
Interrogative form
Simple form
could I bury? could you bury? could she bury? could we bury? could you bury? could they bury?
V-ing form
could I be burying? could you be burying? could she be burying? could we be burying? could you be burying? could they be burying?
Perfect
could I have buried? could you have buried? could she have buried? could we have buried? could you have buried? could they have buried?
V-ing perfect
could I have been burying? could you have been burying? could she have been burying? could we have been burying? could you have been burying? could they have been burying?
Interro-negative form
Simple form
could I not bury? could you not bury? could she not bury? could we not bury? could you not bury? could they not bury?
V-ing form
could I not be burying? could you not be burying? could she not be burying? could we not be burying? could you not be burying? could they not be burying?
Perfect
could I not have buried? could you not have buried? could she not have buried? could we not have buried? could you not have buried? could they not have buried?
V-ing perfect
could I not have been burying? could you not have been burying? could she not have been burying? could we not have been burying? could you not have been burying? could they not have been burying?