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