I could relax you could relax he could relax we could relax you could relax they could relax
V-ing form
I could be relaxing you could be relaxing he could be relaxing we could be relaxing you could be relaxing they could be relaxing
Perfect
I could have relaxed you could have relaxed he could have relaxed we could have relaxed you could have relaxed they could have relaxed
V-ing perfect
I could have been relaxing you could have been relaxing he could have been relaxing we could have been relaxing you could have been relaxing they could have been relaxing
Negation
Simple form
I could not relax you could not relax he could not relax we could not relax you could not relax they could not relax
V-ing form
I could not be relaxing you could not be relaxing he could not be relaxing we could not be relaxing you could not be relaxing they could not be relaxing
Perfect
I could not have relaxed you could not have relaxed he could not have relaxed we could not have relaxed you could not have relaxed they could not have relaxed
V-ing perfect
I could not have been relaxing you could not have been relaxing he could not have been relaxing we could not have been relaxing you could not have been relaxing they could not have been relaxing
Interrogative form
Simple form
could I relax? could you relax? could he relax? could we relax? could you relax? could they relax?
V-ing form
could I be relaxing? could you be relaxing? could he be relaxing? could we be relaxing? could you be relaxing? could they be relaxing?
Perfect
could I have relaxed? could you have relaxed? could he have relaxed? could we have relaxed? could you have relaxed? could they have relaxed?
V-ing perfect
could I have been relaxing? could you have been relaxing? could he have been relaxing? could we have been relaxing? could you have been relaxing? could they have been relaxing?
Interro-negative form
Simple form
could I not relax? could you not relax? could he not relax? could we not relax? could you not relax? could they not relax?
V-ing form
could I not be relaxing? could you not be relaxing? could he not be relaxing? could we not be relaxing? could you not be relaxing? could they not be relaxing?
Perfect
could I not have relaxed? could you not have relaxed? could he not have relaxed? could we not have relaxed? could you not have relaxed? could they not have relaxed?
V-ing perfect
could I not have been relaxing? could you not have been relaxing? could he not have been relaxing? could we not have been relaxing? could you not have been relaxing? could they not have been relaxing?