I can shower you can shower he can shower we can shower you can shower they can shower
V-ing form
I can be showering you can be showering he can be showering we can be showering you can be showering they can be showering
Perfect
I can have showered you can have showered he can have showered we can have showered you can have showered they can have showered
V-ing perfect
I can have been showering you can have been showering he can have been showering we can have been showering you can have been showering they can have been showering
Negation
Simple form
I cannot shower you cannot shower he cannot shower we cannot shower you cannot shower they cannot shower
V-ing form
I cannot be showering you cannot be showering he cannot be showering we cannot be showering you cannot be showering they cannot be showering
Perfect
I cannot have showered you cannot have showered he cannot have showered we cannot have showered you cannot have showered they cannot have showered
V-ing perfect
I cannot have been showering you cannot have been showering he cannot have been showering we cannot have been showering you cannot have been showering they cannot have been showering
Interrogative form
Simple form
can I shower? can you shower? can he shower? can we shower? can you shower? can they shower?
V-ing form
can I be showering? can you be showering? can he be showering? can we be showering? can you be showering? can they be showering?
Perfect
can I have showered? can you have showered? can he have showered? can we have showered? can you have showered? can they have showered?
V-ing perfect
can I have been showering? can you have been showering? can he have been showering? can we have been showering? can you have been showering? can they have been showering?
Interro-negative form
Simple form
can I not shower? can you not shower? can he not shower? can we not shower? can you not shower? can they not shower?
V-ing form
can I not be showering? can you not be showering? can he not be showering? can we not be showering? can you not be showering? can they not be showering?
Perfect
can I not have showered? can you not have showered? can he not have showered? can we not have showered? can you not have showered? can they not have showered?
V-ing perfect
can I not have been showering? can you not have been showering? can he not have been showering? can we not have been showering? can you not have been showering? can they not have been showering?