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 couldn't bury you couldn't bury she couldn't bury we couldn't bury you couldn't bury they couldn't bury
V-ing form
I couldn't be burying you couldn't be burying she couldn't be burying we couldn't be burying you couldn't be burying they couldn't be burying
Perfect
I couldn't have buried you couldn't have buried she couldn't have buried we couldn't have buried you couldn't have buried they couldn't have buried
V-ing perfect
I couldn't have been burying you couldn't have been burying she couldn't have been burying we couldn't have been burying you couldn't have been burying they couldn't 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
couldn't I bury? couldn't you bury? couldn't she bury? couldn't we bury? couldn't you bury? couldn't they bury?
V-ing form
couldn't I be burying? couldn't you be burying? couldn't she be burying? couldn't we be burying? couldn't you be burying? couldn't they be burying?
Perfect
couldn't I have buried? couldn't you have buried? couldn't she have buried? couldn't we have buried? couldn't you have buried? couldn't they have buried?
V-ing perfect
couldn't I have been burying? couldn't you have been burying? couldn't she have been burying? couldn't we have been burying? couldn't you have been burying? couldn't they have been burying?