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 couldn't rest you couldn't rest he couldn't rest we couldn't rest you couldn't rest they couldn't rest
V-ing form
I couldn't be resting you couldn't be resting he couldn't be resting we couldn't be resting you couldn't be resting they couldn't be resting
Perfect
I couldn't have rested you couldn't have rested he couldn't have rested we couldn't have rested you couldn't have rested they couldn't have rested
V-ing perfect
I couldn't have been resting you couldn't have been resting he couldn't have been resting we couldn't have been resting you couldn't have been resting they couldn't 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
couldn't I rest? couldn't you rest? couldn't he rest? couldn't we rest? couldn't you rest? couldn't they rest?
V-ing form
couldn't I be resting? couldn't you be resting? couldn't he be resting? couldn't we be resting? couldn't you be resting? couldn't they be resting?
Perfect
couldn't I have rested? couldn't you have rested? couldn't he have rested? couldn't we have rested? couldn't you have rested? couldn't they have rested?
V-ing perfect
couldn't I have been resting? couldn't you have been resting? couldn't he have been resting? couldn't we have been resting? couldn't you have been resting? couldn't they have been resting?