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