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