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 could not starve you could not starve he could not starve we could not starve you could not starve they could not starve
V-ing form
I could not be starving you could not be starving he could not be starving we could not be starving you could not be starving they could not be starving
Perfect
I could not have starved you could not have starved he could not have starved we could not have starved you could not have starved they could not have starved
V-ing perfect
I could not have been starving you could not have been starving he could not have been starving we could not have been starving you could not have been starving they could not 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
could I not starve? could you not starve? could he not starve? could we not starve? could you not starve? could they not starve?
V-ing form
could I not be starving? could you not be starving? could he not be starving? could we not be starving? could you not be starving? could they not be starving?
Perfect
could I not have starved? could you not have starved? could he not have starved? could we not have starved? could you not have starved? could they not have starved?
V-ing perfect
could I not have been starving? could you not have been starving? could he not have been starving? could we not have been starving? could you not have been starving? could they not have been starving?