I could shower you could shower he could shower we could shower you could shower they could shower
V-ing form
I could be showering you could be showering he could be showering we could be showering you could be showering they could be showering
Perfect
I could have showered you could have showered he could have showered we could have showered you could have showered they could have showered
V-ing perfect
I could have been showering you could have been showering he could have been showering we could have been showering you could have been showering they could have been showering
Negation
Simple form
I couldn't shower you couldn't shower he couldn't shower we couldn't shower you couldn't shower they couldn't shower
V-ing form
I couldn't be showering you couldn't be showering he couldn't be showering we couldn't be showering you couldn't be showering they couldn't be showering
Perfect
I couldn't have showered you couldn't have showered he couldn't have showered we couldn't have showered you couldn't have showered they couldn't have showered
V-ing perfect
I couldn't have been showering you couldn't have been showering he couldn't have been showering we couldn't have been showering you couldn't have been showering they couldn't have been showering
Interrogative form
Simple form
could I shower? could you shower? could he shower? could we shower? could you shower? could they shower?
V-ing form
could I be showering? could you be showering? could he be showering? could we be showering? could you be showering? could they be showering?
Perfect
could I have showered? could you have showered? could he have showered? could we have showered? could you have showered? could they have showered?
V-ing perfect
could I have been showering? could you have been showering? could he have been showering? could we have been showering? could you have been showering? could they have been showering?
Interro-negative form
Simple form
couldn't I shower? couldn't you shower? couldn't he shower? couldn't we shower? couldn't you shower? couldn't they shower?
V-ing form
couldn't I be showering? couldn't you be showering? couldn't he be showering? couldn't we be showering? couldn't you be showering? couldn't they be showering?
Perfect
couldn't I have showered? couldn't you have showered? couldn't he have showered? couldn't we have showered? couldn't you have showered? couldn't they have showered?
V-ing perfect
couldn't I have been showering? couldn't you have been showering? couldn't he have been showering? couldn't we have been showering? couldn't you have been showering? couldn't they have been showering?