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