I could rest you could rest he could rest we could rest you could rest they could rest
V-ing form
I could be resting you could be resting he could be resting we could be resting you could be resting they could be resting
Perfect
I could have rested you could have rested he could have rested we could have rested you could have rested they could have rested
V-ing perfect
I could have been resting you could have been resting he could have been resting we could have been resting you could have been resting they could have been resting
Negation
Simple form
I could not rest you could not rest he could not rest we could not rest you could not rest they could not rest
V-ing form
I could not be resting you could not be resting he could not be resting we could not be resting you could not be resting they could not be resting
Perfect
I could not have rested you could not have rested he could not have rested we could not have rested you could not have rested they could not have rested
V-ing perfect
I could not have been resting you could not have been resting he could not have been resting we could not have been resting you could not have been resting they could not have been resting
Interrogative form
Simple form
could I rest? could you rest? could he rest? could we rest? could you rest? could they rest?
V-ing form
could I be resting? could you be resting? could he be resting? could we be resting? could you be resting? could they be resting?
Perfect
could I have rested? could you have rested? could he have rested? could we have rested? could you have rested? could they have rested?
V-ing perfect
could I have been resting? could you have been resting? could he have been resting? could we have been resting? could you have been resting? could they have been resting?
Interro-negative form
Simple form
could I not rest? could you not rest? could he not rest? could we not rest? could you not rest? could they not rest?
V-ing form
could I not be resting? could you not be resting? could he not be resting? could we not be resting? could you not be resting? could they not be resting?
Perfect
could I not have rested? could you not have rested? could he not have rested? could we not have rested? could you not have rested? could they not have rested?
V-ing perfect
could I not have been resting? could you not have been resting? could he not have been resting? could we not have been resting? could you not have been resting? could they not have been resting?