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