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 couldn't relax you couldn't relax he couldn't relax we couldn't relax you couldn't relax they couldn't relax
V-ing form
I couldn't be relaxing you couldn't be relaxing he couldn't be relaxing we couldn't be relaxing you couldn't be relaxing they couldn't be relaxing
Perfect
I couldn't have relaxed you couldn't have relaxed he couldn't have relaxed we couldn't have relaxed you couldn't have relaxed they couldn't have relaxed
V-ing perfect
I couldn't have been relaxing you couldn't have been relaxing he couldn't have been relaxing we couldn't have been relaxing you couldn't have been relaxing they couldn't 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
couldn't I relax? couldn't you relax? couldn't he relax? couldn't we relax? couldn't you relax? couldn't they relax?
V-ing form
couldn't I be relaxing? couldn't you be relaxing? couldn't he be relaxing? couldn't we be relaxing? couldn't you be relaxing? couldn't they be relaxing?
Perfect
couldn't I have relaxed? couldn't you have relaxed? couldn't he have relaxed? couldn't we have relaxed? couldn't you have relaxed? couldn't they have relaxed?
V-ing perfect
couldn't I have been relaxing? couldn't you have been relaxing? couldn't he have been relaxing? couldn't we have been relaxing? couldn't you have been relaxing? couldn't they have been relaxing?